sGPA is the general term, and is calculated differently between DO and MD programs; BCPM only makes sense for MD programs. DO programs do not include math (M) in the sGPA, but include "other sciences". The respective application manuals provide more detail for what's science and not.
And I beliebe they look at cumulative overall and science gpa for "minimums", and then once a person looks at it they will evaluate trends, etc. it seems likely that sGPA is more important, but a poor gpa for other courses isn't a good sign to a reviewer.