Different overlays for same core?

I am using the same core for Magadrive and GameGear games, but i want one overlay for Magadrive and a different overlay for GameGear games. Is that possible and if so, how?

(i want to avoid creating overlays per game)

If you’re in Windows, you can use these split cores I made: http://libretro.com/forums/showthread.php?t=5391 They’re exactly the same as the normal ones, I just changed their internal names and recompiled them so RetroArch sees them as a different core.

Thanks! I hope that you will update them if there are changes in the future, so they will keep working with future Retroarch versions…