If they are recently imported L144, then that is most likely the
("fake L144"), and whilst there are theoretically many different albino forms of Ancistrus, they are most likely the same species. Since the albino gene and the amelanistic gene are different genes, you get normal coloured ones as the result.
If the L144 or "old" L144's (that is TRUE L144), then what you have are hybrids, since the true L144 is [to the best of our knowledge] a different.
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Mats