This question is answered in the FAQ at the top of the page...
What is the difference between a Colombian Bci and a Bcc?
The differences between the two subspecies are minimal. Bcc were the original "redtailed boas", however several decades ago dealers began applying the same name to the Colombian boas in order to squeeze some extra money out of their sales, as "true redtails" tended to have a nicer appearance to them. Bcc sometimes display a brighter tail colouration, more colouration throughout their body (silvers and/or pinks and/or purples), shaplier saddles that may have more contrast, and less than 22 saddles. Bci may have more or less than 22 saddles, which makes this method of identification unreliable. Bci have a much quicker growth rate than Bcc do and can easily attain lengths of 6' or more by their second birthday. They both finish up the same size in the end however. They generally have the same maintenance requirements as well.
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