Two Stripes with same output

[HENN0]

Hi all,

I have two WS2815 stripes, each 285 LEDs
Straight ~9,5m
Both parallel with 8cm distance.
Each wired to an own GPIO

I want to have both stripes be 100% same.
With any moving effect it will look terrible.

I cannot wire both to one GPIO due two different branches from same supplier.
One is RGB, the other GRB

I tried many different settings but I cannot find any solution to "mirror" both stripes

Any solution for this ?

Found it now after long search by myself

Custom bus start indices enabled in led settings