Previous Post Has it been stated why Kwannon's hair is black and Betsy's is purple when it's long been established that Kwannon's hair is naturally purple and Betsy has always dyed hers? Thanks in advance!

Uh uh... and originally, Rogue bleached the stripe(s) in her hair. She even said so when she joined X-Men, changing from white temples to the stripe.

But at some point we even got flashbacks of her as a kid with stripe.

As for Betsy, my fanon explanation is that their DNA changed because the two did not simply switch bodies. They merged bodies on a genetic level, but not completely. This is even stated in the Kwannon story back in the 90s.