S&W 5946 TSW magazines

I just bought one of these because I was told (several times) that it uses the same mags as my Marlin Camp 9 (for which I have many mags). Wrong! The 5946 won't retain any of the Camp 9 mags, but will hold the one that came with it (and is the only one with an orange follower). The Camp 9 holds all of the mags that came with it - and some of them are marked S&W - and also holds the "new" ss mag from the 5946. :veryconfu

Close examination of the "retention notch" reveals that the "orange" mag notch is somewhat taller than any of the other mags. Did Smith change the notch somewhere along the way, and does that mean that I have to open up all of the Camp 9 mag notches? Not a happy camper right now, so I'm hoping someone knows a simple solution.