I have a similar question.
I bought bands at the park (off-site stay) and
A. have my 10-day no expiration tickets on them.
B. I plan on staying on site in August and thus have 3 bands
C. (not sure why they are sending me a band for my 2-year old) coming to me.
1) Can I link up my no-expiration tickets to the new bands?
2) What happens to the old bands? They just trash? Backups in case you lose the new ones? (if indeed you can't just unlink the tickets and give the band to someone else (like the OP is asking).