They are both really nice! The hypo BCI has awesome orange in his tail. They will both grow into stunner adults!
I think you'll find the BCC to be a longer thinner snake(IMO).
Fat boas die young. Be careful not to over feed. I know you did the research and all, but avoid trying to fatten them up like a ball python.
Congrats on picking these up! Your gonna love your new boas!