It's interesting you bring up the ball axanthic/snow scenario.
In addition to the "real" boas i am also involved with developing rosy boa morphs. Here are a couple of examples from the rosy's that illustrate my query.
#1 refered to as axanthic

#2 combined with an albino gene makes pure white

#3 refered to as an anery

#4 the resulting snow with traces of orange


as you can see the two anery/axanthics look very similar in appearearence, but certainly do not produce the same snow when bred to an albino.

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