BCC are generally a tad more picky when it comes to husbandry requirements than BCI. Sometimes they can be more nervous too. A BCC is going to be more expensive than a Colombian BCI.. though you can find less expensive BCC. 6-8' is pretty typical.. females being larger. Either subspecies has the capacity to hit 10', though it's not really common.

BCC = boa constrictor constrictor
BCI = boa constrictor imperator