Well that's pretty cool I didn't know they had smaller versions....any pictures of the nicaraguan boas? I googled it but they look very similar if not the same as the columbians etc.
Check out Rio Bravo Reptiles and check out the locality boas.
There are several localities (sonoran desert, tarahumara, cay caulker, corn island, crawl cay, etc.) that are all red-tail, but in a much smaller package.