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Well, given the backstory for the Lashunta, I would expect their skin coloration to tend towards camouflage colors. . . albeit camouflage by Castovelian standards.
That's an interesting thought. They are slightly insectile with their antennae so having skin match environment is feasible. Since Castrovel is a jungle, the idea of them having their skin match sunlight intake so it being like that theory about Human skin tone evolution is right out. They would be black in Pathfinder instead of white. So your conjecture is more likely.
So them being white or light pink means that the environment of Castrovel would have something white for them to blend into. The planet is called "The Green" so they should be greener I think.
Then again, they now have the bioengineering to control what subspecies a child turns to so the idea that they can change skin tone to whatever they'd like it is also valid.