I recently saw a new SD9VE in a local pawn shop and grabbed it immediately as they have been nearly impossible to come by lately. My wife just bought a SW9F she came across. I couldn't help but notice that the magazines are nearly identical. Does anyone know if these are fully interchangeable? Also, her SW9F came with a 10-round mag. Didn't these originally come with a 17-round or was the 10 an option?