I have dissected some snakes. As far as I could tell, each testis connected to only one hemipenis.

In a chimera, both testes could belong to only one member of the chimera, one testis could belong to one and the other testis to the other, or there could be a mixture in one or both testes. So a chimera could be proven homozygous albino or heterozygous albino by breeding test. Or even normal if one member of a paradox albino chimera was genotypically homozygous normal.

Recently I happened across some material on double yolked eggs in pigeons. They seem more likely to be produced in large, well-fed birds. Birds of smaller breeds and less well-fed birds of all breeds seem less likely to produce double yolked eggs. A chimera would hatch from a double yolked egg. And royal pythons in captivity are generally fatter than their wild cousins.