Albino and Candy/Toffee are allelic
Ultramel, Crider, and Burgundy Albino are allelic (there is speculation that Monarch may be in this group as well, but so far no one has done the breeding to prove it)
There are multiple different lines of Caramel that have originated from different imported animals but all are called Caramel
Likewise, there are multiple different lines of Lav that have originated from different imported animals but all are called Lav
There are, to date, five different types of Axanthinc that have been prove to not be compatible with one another: VPI, TSK, Joliff, Markus Jayne, and BlackAx