I used mine from a Droid X and had no problem.
I would suggest if you use one from another phone that you copy the stuff over to your PC that you want to keep and then FORMAT the card. Then copy the stuff back to the SD card. Let the GS3 create the new file structure on the card. Otherwise, it can get kinda confusing. I have done it this way in the past.
Not sure it really matters, but I like to have a clean slate for a new phone.