We have a similar thing with the RAF/AE Brevet divide, and the end result we were told was that, if you did the course before it changed you can wear either. If you did it after it changed then you can only wear the RAF, and on our squadron its the same for the Navs.
However we were also told we could wear trade specific brevets on out No. 5's no matter what course you did. Not so sure about how true that is
