That's my understanding having asked someone in the BBKA. There was a question as to whether the BBKA would accept SBA certificates when it came to issuing the wider awards. i.e. if you had BBKA modules 1,3&5 it's not clear that if you turned up with an SBA module 2 certificate whether they'd award you the intermediate theory certificate. But in terms of syllabus etc they're identical.

I'll try and dig up some info more pertinent to the SBA board/timetables.