It probalbely will work find except the head diameter is about .005/.010 different. The 38 Super is larger. When used with 9mm brass the rounds wil be pushed to the side .005 or more depending on the clearance in the slide breach face. In most cases this will not cause a problem but in a few case it can cause infrenquent failure to feed.
THe 38 super mags have worked for me for over 15 years. I have Metalform, Megar and old Wilson's. If I had my choice I would buy the Metalforms as they seem to work better than the Megar's and I don't believe the Wilson's are available any more.
I have used both 9mm factory and reloaded ammo in the super mags with great sucess. I like a longer 9mm round if I reload and it fits in throat of the barrel. They seem to be softer shooting and less pressure if you decide to push a 9mm hard.