There are three... kinda four issues with Boa breedings...
You have the following that apply to any given snake, might not always be mentioned, but apply nonetheless:
Subspecies- the taxonimic classification that comes after "Boa constrictor" and defines the borders of the naturally interbreeding populations.
Locale- The country that the animal or the bloodline originated in.
Population- for insular populations within a subspecies, Hogg Islands for instance.
Morph/Phenotype/Genotype- pretty much what it looks like, what it is genetically.
Sometimes you will see it assumed that additional information is known simply by using one of these terms... some terms are used interchangeably or terms that denote a subspecies also denote a locale or a population.
As a purist myself... I don't like seeing boa subspecies or boa locales crossed with one another based solely on what happens to be avaliable as a male and a female, I like the idea of bloodlines that represent, to as strong a degree as possible, an animal that is genetically as close as possible to fresh out of the wild. Of course, by the defenition of a species, subspecies at some point interbreed with other subspecies and form areas of intergradiation. With a species that has as many reccognized and accepted subspecies as Boa constrictor however, not every subspecies will encounter any other given subspecies, many of them have entire populations of animals or geographic features keeping them apart.
On the flip side of this however are two very strong arguments... One, that these animals will never be released into the wild, so the genetics aren't as important as the value the animal has as a pet (not just money value either). Two that every captive breeding represents a choice of animals made by a human, skipping the entire natural selection process every time it happens. The first is a bit iffy, but the second I must admit is true... Even crossing two animals of the same subspecies, care is often taken to find the best two avaliable (or the first two avaliable) and the snakes instincts don't really enter into the proceedings as they're presented with one, or at most a few, potential mates.
Bottom line... it's your choice. Some people (like me) will have moral issues with the pairing. Others will have no problems whatsoever... As long as you represent the offspring honestly to everyone who obtains one from you, you've fufilled your moral responsibility.
