The correct way, if you wanted to be sure is to count scales. Although in a pet shop setting this is not so easy. As it is most often done with a shed. Judging by color or patteren is not a very good way to tell, although some people think they know, this is not the way it is done on a scientific level. You may be able to study enough photos of known subspieces to tell. Yet you must also remember that as a boa matures it's looks will change too.

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