All ball pythons have some degree of color change between their backs, sides, and bellies. And normal ball pythons can vary a LOT in patterns and colors.
Is it possible that either of them are het for something recessive? Possible. But there's no way to tell or guess just by looking. And without knowing what that something might be, it is pretty difficult (but not impossible) to prove out. I wouldn't bother trying unless you "knew" it was het for something.