If you have AMS just use provided print profile
Swap Instructions (if you do not have AMS):
Start with black PLA Basic | Bambu Lab EU
At layer #7 (1.40mm) swap to Gray PLA Basic Filament with spool / 1kg / Black (10101) | Bambu Lab EU
At layer #13 (2.60mm) swap to White for the rest PLA Basic Filament with spool / 1kg / Black (10101) | Bambu Lab EU
You can scale up and down but only X and Y. Z axis must remain the same as original