Are you able to reference a gamepass from a different place to give a user an item?
Personally, I think it can. If you have an gamepass for another game, and want to use it in both games I think it is possible. Just make sure you have the same ID,as the gamepass in the other game, and put that in your script!
Hope this helps. If you have any issues, reply to this answer please.
I think you can. Here are the steps that, If you follow, I'm sure it'll work. First, Go to the gamepass you'd like to use. Get its ID, then go in the gamepass you putted in RS (Roblox Studio) and change the ID to the ID you copied. I think it should work!