diff --git a/dist/restore/index.js b/dist/restore/index.js
index 8c765ad..bc3765f 100644
--- a/dist/restore/index.js
+++ b/dist/restore/index.js
@@ -6572,10 +6572,11 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.listObjects = exports.findObject = exports.setCacheHitOutput = exports.formatSize = exports.getInputAsInt = exports.getInputAsArray = exports.getInputAsBoolean = exports.newMinio = exports.isGhes = void 0;
+exports.isExactKeyMatch = exports.saveMatchedKey = exports.listObjects = exports.findObject = exports.setCacheHitOutput = exports.formatSize = exports.getInputAsInt = exports.getInputAsArray = exports.getInputAsBoolean = exports.newMinio = exports.isGhes = void 0;
 const utils = __importStar(__webpack_require__(15));
 const core = __importStar(__webpack_require__(470));
 const minio = __importStar(__webpack_require__(223));
+const state_1 = __webpack_require__(179);
 function isGhes() {
     const ghUrl = new URL(process.env['GITHUB_SERVER_URL'] || 'https://github.com');
     return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM';
@@ -6640,8 +6641,9 @@ function findObject(mc, bucket, keys, compressionMethod) {
                 continue;
             }
             const sorted = objects.sort((a, b) => b.lastModified.getTime() - a.lastModified.getTime());
-            core.debug(`Using latest ${JSON.stringify(sorted[0])}`);
-            return sorted[0];
+            const result = { item: sorted[0], matchingKey: key };
+            core.debug(`Using latest ${JSON.stringify(result)}`);
+            return result;
         }
         throw new Error("Cache item not found");
     });
@@ -6670,6 +6672,21 @@ function listObjects(mc, bucket, prefix) {
     });
 }
 exports.listObjects = listObjects;
+function saveMatchedKey(matchedKey) {
+    return core.saveState(state_1.State.MatchedKey, matchedKey);
+}
+exports.saveMatchedKey = saveMatchedKey;
+function getMatchedKey() {
+    return core.getState(state_1.State.MatchedKey);
+}
+function isExactKeyMatch() {
+    const matchedKey = getMatchedKey();
+    const inputKey = core.getInput("key", { required: true });
+    const result = getMatchedKey() === inputKey;
+    core.debug(`isExactKeyMatch: matchedKey=${matchedKey} inputKey=${inputKey}, result=${result}`);
+    return result;
+}
+exports.isExactKeyMatch = isExactKeyMatch;
 
 
 /***/ }),
@@ -6931,7 +6948,20 @@ module.exports = from;
 /***/ }),
 /* 177 */,
 /* 178 */,
-/* 179 */,
+/* 179 */
+/***/ (function(__unusedmodule, exports) {
+
+"use strict";
+
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.State = void 0;
+var State;
+(function (State) {
+    State["MatchedKey"] = "matched-key";
+})(State = exports.State || (exports.State = {}));
+
+
+/***/ }),
 /* 180 */,
 /* 181 */,
 /* 182 */,
@@ -80811,8 +80841,9 @@ function restoreCache() {
                 const cacheFileName = utils.getCacheFileName(compressionMethod);
                 const archivePath = path.join(yield utils.createTempDirectory(), cacheFileName);
                 const keys = [key, ...restoreKeys];
-                const obj = yield utils_1.findObject(mc, bucket, keys, compressionMethod);
+                const { item: obj, matchingKey } = yield utils_1.findObject(mc, bucket, keys, compressionMethod);
                 core.debug("found cache object");
+                utils_1.saveMatchedKey(matchingKey);
                 core.info(`Downloading cache from s3 to ${archivePath}. bucket: ${bucket}, object: ${obj.name}`);
                 yield mc.fGetObject(bucket, obj.name, archivePath);
                 if (core.isDebug()) {
diff --git a/dist/save/index.js b/dist/save/index.js
index 427bb59..7de64fe 100644
--- a/dist/save/index.js
+++ b/dist/save/index.js
@@ -6572,10 +6572,11 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.listObjects = exports.findObject = exports.setCacheHitOutput = exports.formatSize = exports.getInputAsInt = exports.getInputAsArray = exports.getInputAsBoolean = exports.newMinio = exports.isGhes = void 0;
+exports.isExactKeyMatch = exports.saveMatchedKey = exports.listObjects = exports.findObject = exports.setCacheHitOutput = exports.formatSize = exports.getInputAsInt = exports.getInputAsArray = exports.getInputAsBoolean = exports.newMinio = exports.isGhes = void 0;
 const utils = __importStar(__webpack_require__(15));
 const core = __importStar(__webpack_require__(470));
 const minio = __importStar(__webpack_require__(223));
+const state_1 = __webpack_require__(179);
 function isGhes() {
     const ghUrl = new URL(process.env['GITHUB_SERVER_URL'] || 'https://github.com');
     return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM';
@@ -6640,8 +6641,9 @@ function findObject(mc, bucket, keys, compressionMethod) {
                 continue;
             }
             const sorted = objects.sort((a, b) => b.lastModified.getTime() - a.lastModified.getTime());
-            core.debug(`Using latest ${JSON.stringify(sorted[0])}`);
-            return sorted[0];
+            const result = { item: sorted[0], matchingKey: key };
+            core.debug(`Using latest ${JSON.stringify(result)}`);
+            return result;
         }
         throw new Error("Cache item not found");
     });
@@ -6670,6 +6672,21 @@ function listObjects(mc, bucket, prefix) {
     });
 }
 exports.listObjects = listObjects;
+function saveMatchedKey(matchedKey) {
+    return core.saveState(state_1.State.MatchedKey, matchedKey);
+}
+exports.saveMatchedKey = saveMatchedKey;
+function getMatchedKey() {
+    return core.getState(state_1.State.MatchedKey);
+}
+function isExactKeyMatch() {
+    const matchedKey = getMatchedKey();
+    const inputKey = core.getInput("key", { required: true });
+    const result = getMatchedKey() === inputKey;
+    core.debug(`isExactKeyMatch: matchedKey=${matchedKey} inputKey=${inputKey}, result=${result}`);
+    return result;
+}
+exports.isExactKeyMatch = isExactKeyMatch;
 
 
 /***/ }),
@@ -6931,7 +6948,20 @@ module.exports = from;
 /***/ }),
 /* 177 */,
 /* 178 */,
-/* 179 */,
+/* 179 */
+/***/ (function(__unusedmodule, exports) {
+
+"use strict";
+
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.State = void 0;
+var State;
+(function (State) {
+    State["MatchedKey"] = "matched-key";
+})(State = exports.State || (exports.State = {}));
+
+
+/***/ }),
 /* 180 */,
 /* 181 */,
 /* 182 */,
@@ -76653,6 +76683,10 @@ process.on("uncaughtException", (e) => core.info("warning: " + e.message));
 function saveCache() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
+            if (utils_1.isExactKeyMatch()) {
+                core.info("Cache was exact key match, not saving");
+                return;
+            }
             const bucket = core.getInput("bucket", { required: true });
             const key = core.getInput("key", { required: true });
             const useFallback = utils_1.getInputAsBoolean("use-fallback");
diff --git a/src/restore.ts b/src/restore.ts
index 9abe919..a00cf4e 100644
--- a/src/restore.ts
+++ b/src/restore.ts
@@ -11,6 +11,7 @@ import {
   isGhes,
   newMinio,
   setCacheHitOutput,
+  saveMatchedKey,
 } from "./utils";
 
 process.on("uncaughtException", (e) => core.info("warning: " + e.message));
@@ -34,8 +35,9 @@ async function restoreCache() {
       );
       const keys = [key, ...restoreKeys];
 
-      const obj = await findObject(mc, bucket, keys, compressionMethod);
+      const { item: obj, matchingKey } = await findObject(mc, bucket, keys, compressionMethod);
       core.debug("found cache object");
+      saveMatchedKey(matchingKey);
       core.info(
         `Downloading cache from s3 to ${archivePath}. bucket: ${bucket}, object: ${obj.name}`
       );
diff --git a/src/save.ts b/src/save.ts
index ad98705..734c51d 100644
--- a/src/save.ts
+++ b/src/save.ts
@@ -3,12 +3,17 @@ import * as utils from "@actions/cache/lib/internal/cacheUtils";
 import { createTar, listTar } from "@actions/cache/lib/internal/tar";
 import * as core from "@actions/core";
 import * as path from "path";
-import { getInputAsArray, getInputAsBoolean, isGhes, newMinio } from "./utils";
+import { getInputAsArray, getInputAsBoolean, isGhes, newMinio, isExactKeyMatch } from "./utils";
 
 process.on("uncaughtException", (e) => core.info("warning: " + e.message));
 
 async function saveCache() {
   try {
+    if (isExactKeyMatch()) {
+      core.info("Cache was exact key match, not saving");
+      return
+    }
+
     const bucket = core.getInput("bucket", { required: true });
     const key = core.getInput("key", { required: true });
     const useFallback = getInputAsBoolean("use-fallback");
diff --git a/src/state.ts b/src/state.ts
new file mode 100644
index 0000000..fdabb09
--- /dev/null
+++ b/src/state.ts
@@ -0,0 +1,3 @@
+export enum State {
+    "MatchedKey" = "matched-key"
+}
diff --git a/src/utils.ts b/src/utils.ts
index e39e721..b6a305d 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -2,6 +2,7 @@ import { CompressionMethod } from "@actions/cache/lib/internal/constants";
 import * as utils from "@actions/cache/lib/internal/cacheUtils";
 import * as core from "@actions/core";
 import * as minio from "minio";
+import {State} from "./state";
 
 export function isGhes(): boolean {
   const ghUrl = new URL(
@@ -66,12 +67,17 @@ export function setCacheHitOutput(isCacheHit: boolean): void {
   core.setOutput("cache-hit", isCacheHit.toString());
 }
 
+type FindObjectResult = {
+  item: minio.BucketItem
+  matchingKey: string
+}
+
 export async function findObject(
   mc: minio.Client,
   bucket: string,
   keys: string[],
   compressionMethod: CompressionMethod
-): Promise<minio.BucketItem> {
+): Promise<FindObjectResult> {
   core.debug("Restore keys: " + JSON.stringify(keys));
   for (const key of keys) {
     const fn = utils.getCacheFileName(compressionMethod);
@@ -85,8 +91,9 @@ export async function findObject(
     const sorted = objects.sort(
       (a, b) => b.lastModified.getTime() - a.lastModified.getTime()
     );
-    core.debug(`Using latest ${JSON.stringify(sorted[0])}`);
-    return sorted[0];
+    const result = { item: sorted[0], matchingKey: key };
+    core.debug(`Using latest ${JSON.stringify(result)}`);
+    return result;
   }
   throw new Error("Cache item not found");
 }
@@ -117,3 +124,20 @@ export function listObjects(
     }, 10000);
   });
 }
+
+export function saveMatchedKey(matchedKey: string) {
+  return core.saveState(State.MatchedKey, matchedKey);
+}
+
+function getMatchedKey() {
+  return core.getState(State.MatchedKey);
+}
+
+export function isExactKeyMatch(): boolean {
+  const matchedKey = getMatchedKey();
+  const inputKey = core.getInput("key", { required: true });
+  const result = getMatchedKey() === inputKey
+  core.debug(`isExactKeyMatch: matchedKey=${matchedKey} inputKey=${inputKey}, result=${result}`)
+  return result
+}
+