My understanding is that they are "almost" the same .... to the untrained eye, we would probably not see the difference. I believe that one is more flat on the top/bottom whereas the other is slightly curved. And no, I have no clue as to which is which.
You might get away with using them in both machines ... but that also might cause some inconsistent stitch issues. Might not happen at once, but eventually ... and you may not know why?
The best way to know would be to ask your dealer.