The pins are still the same. As far as the actual modification goes, it might be better to hear from someone who can directly compare (all my game systems are currently in a different continent), but as far as I remember, if you were to get a Super Famicom to take SNES carts you would need to remove a significant amount of plastic. I feel like it's not just the bezel, but also the inside of the machine that's narrower, but I'm 100% unsure on that point.
(I don't have my Super Famicom on hand, so this is partly from memory)
So, the bad news is that while it's really easy to play Super Famicom games on a Super Nintendo, it's really hard to go the other way around. The width of Super Famicom cartridges is much shorter, so the whole bezel and slot is as well. They're shaped differently too; the SNES carts are rectangular while the front of a Super Famicom cart is curved. You would basically have to destroy a Super Nintendo cart/the console to get it to fit, or just remove and insert the boards directly. There are adapters, but as far as I know they are all made for the Japanese domestic market, so you'd have to import one. It's probably easier to get a separate beater SNES.
Edit- Oh, I missed the part where you're not interested in playing Super Famicom games. You might just be out of luck then. Maybe a SNES model 2 instead?