The proof is in clutch mates looking completely different, I looked before but couldn't find it, but there was a picture a couple years back of two snakes one looking very yellow and what everyone said was a typical butter back then and then one that looked like what was called a typical lesser back then. Later reviled that the two snakes were in fact clutchmates. Also as someone who has produced his fair share of lessers, I have had some more yellow, so with higher flames, some blushed out more than others, some with darker blacks. All father by the same snake. What I say comes from personal experience along with seeing tons of other examples. They are the same thing.
I also not sure what your challenge is supposed to prove? One example of each animal?