Albino corys

I purchased 8 bronze albino corys from my LFS a couple of months back.

I noticed that 4 was a slightly different shade to the other 4 but thought that might be the norm for albinos. But as times gone by the 1set have grown larger fins and the general look between the 2 are different.

Got me thinking if 4 are actually albino peppers or something else??

I would tend to think they are either albino of different species, or different varieties of one species. There are long-fin varieties of some species.