They are different subspecies.. and there are different localities of each subspecies (ie Colombian BCI, Suriname BCC etc)

There are many boa constrictor subspecies (and more localities yet)

Of BCI there are Colombian, Central American, Hog Island, Nicaraguan.. and probably more I'm forgetting. Colombians have more morphs than any of the other boa constrictors.. they're also the most common in captivity. Just a few: albino, coral albino, caramel albino, salmon, hypo, arabesque, jungle, snow, sunglow, anerythristic, motley, ghost.. ok that was more than just a few. There are a few BCI morphs in other localities.. the blood boa, leopard boa, T+ albino nicaraguan.. etc

Of BCC there's Surinam, Guyanan, Peruvian, Trinidad, another Colombian.. and a few others that are not common in the pet trade. I can't think of any morphs in these that weren't introduced into the bloodline from other subspecies.

BC Occientialis - the Argentine boa. There is a t+ albino morph.

BC Amarali - Bolivian and Bolivian short tail boa. Don't know of any morphs, though exceptional Bolivian specimens are called Silverbacks. These are some knock-out boas.

BC Longicauda - Peruvian longtail boa. Not common, but really cool snake. Almost black and white in nice specimens. There is an anery morph.

There's a few other subspecies, but they're quite rare.