Naw they don't care. We trade out all the time. Even easier if you still have the card form of your ticket for him to use just to scan, and you can keep your magic band. Otherwise, you can strap the band on and send him thru. They see the name flash and a check mark but that's about it. They won't really know otherwise, and if they even knew, and probably wouldn't care even if they did. It's just as long as its green and a valid FL. (Same does not apply to ticket entrance obviously but FPs are free so they don't care.)