The Trade Stations need to change based on your color mode. RYB should have RYB as the first. CYMK should have the lower and higher levels skin colors swapped, including Black and White.
Overall, you could just tie all colored things, like trains, too, to the color mode, giving players an Orange Train instead of Cyan in RYB and a Black instead of White in CYMK, while also reversing the unlock so the Cyan is the first to unlock with Yellow and Magenta the first extras to unlock.