I currently own a Ronin 4.25" 9mm. I'm about to purchase a Ronin 4" EMP 9mm. I'd really like it if the mags were interchangeable. Website says one is a 10 round and the other is a 9 round. Other than capacity does anyone know if they are interchangeable? I'd love to have a shooting bag with a bunch of mags good for either gun.