The google she knows much.

In a nutshell BCCs(Boa Constrictor Constrictor) are more colorful and typically more demanding as far as care. They can also grow larger. BCIs(Boa Constrictor Imperator) are the "common" boas although there are a ton of genetic morphs out there. They are usually easy to take care of and tame and max out at about 9 feet.