The difference is huge, brazilian rainbow boas get a good bit larger, and are red with black patterning. Colombian rainbow boas are smaller and brown, and typically by the time they're an adult they've lost almost all pattern. Venezuelan rainbow boas I don't know much about however it seems like they're also brown but might keep their patterning a little better than colombians. Care between BRB's and CRB's is pretty much identical, BRB's will need more space and are a little more sensitive to higher temps and low humidity.
This photo belongs to a member here with the user name "McCarthy Boas" this is an adult male brazilian.
This is my photo, this is a pair of adult colombian rainbow boas going on 6 years old. Male is in my hand, female is curled up. She's about 4.5 ft
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