Excellent info above. There are some boas in Colombia, the one that I own in fact that have what would be deemed "overlapping" qualities. Here again the Russo book explains.
This guy is a BCI. He is from the Barranquilla region of Colombia. It's in the northern part of the country where the Andes Mountains, a natural separation barrier between mainland BCI and BCC, lowers and there can be integration between the two.
He was produced by Gus Rentfro of Rio Bravo Reptiles and sold to me by Legacy Reptiles, also a strong locality boa breeding facility.
My particular locality BCI is said to be what a natural cross between BCC and BCI would look like. The scale counts, saddles and some other characteristics differ greatly from other mainland BCI.
Lucky for me, he has the hardiness and temperament mainland BCI are know for. In reality it is a "common Colombian boa" that is not so common LOL!
I think xFenrir has put together the ultimate list right there!
Read that and you'll learn a thing or two.
And to the O/P,,, you can see the pronounced jaw muscles in your snake there. BIG muscles!!