Resurrecting an old thread - I'm interested in the legalities and regulations surrounding "differences courses", in particular the Global Classic/XRS to Vision. Just interested in the FAA Part 91 case - do both the captain and copilot need to have done the differences course? I imagine there are insurance ramifications and I'm also aware that is would certainly not be ideal if both crew had not completed the training, but interested in the rules surrounding differences courses. I understand that your licence will still only have BD700 on it - would appreciate any thoughts!
If you are only interested in FAA part 91 regs then the SIC doesn't even need a type rating much less a differences course. As long as he has 3 TOs and Landings in the AC and has appropriate FAA license i.e. multi engine land, instrument. Insurance will be a different story, they will want formal sim within the last year.