Brandon,
I feel they are basically the same morph. They both can produce pewters when bred to jungle pastels and the super form of each is a pattenless snake. From what I heard BHB produced a dark, patternless snake from a cinny x black pastel cross (Brian, please correct me if I'm wrong). However, there does seem to be a slight color and pattern difference between what people are calling a black pastel and a what they call a cinnamon pastel. From the limited number of crosses involving black pastels and cinny's it seems to me that the black pastel adds a richer color to the resulting offspring than does the cinny (Although I'm slightly biased towards the black pastel b'c that's what I'm working with... LOL).
I'm by no means an expert on either of these 2 lines. Just stating what I've heard and my own observations on the subject.
Hope this helps,
Tom