Gorgeous! What a tail!
Are we talking species or morphs?
In terms of species, it is either a red tail boa,
Boa constrictor constrictor, such as those of Suriname, Guyana, and Peru, or a common Northern boa,
Boa constrictor imperator, which are located throughout North America, most commonly Columbia. BCIs are often labeled as red tails, although they are very different.
The saddle count and the tail coloring leads me to believe that it is a BCC, but the head shape and the upper body coloring (primarily the lack of pink and speckling) suggests it is a BCI. It could also be a cross between a BCC and a BCI.
BCC morphs are virtually non-existent. I do believe albino Suriname BCCs have been produced, but are extraordinarily rare and would cost a small fortune.
Columbian BCI morphs are extremely common and can range from $100 to $10,000. While I am no expert, I do not believe that yours is a morph. Pastel is a possibility, but the major lines of pastel boas were selectively bred with a much cleaner pattern. (Imo, I really like speckling on a boa, I don't know why breeders prefer them clean.)
In any case, that is one amazing snake!
