I have an 09 SE EFI Tuner interface box that was used to tune by 09 Fat Boy at the dealership.
Box version question: Can this same 09 box be used to tune my 12 Street Glide at the dealership? or must I get a newer version of the box for the 12?
Box multiple bike usage question: Can the same one box be used for tuning both bikes at the dealership? or must each bike have it's own box?

 

No , tuner is tied to the VIN of the bike.

 

the tuner is married to the original bike, TTS was upgrading the one you have for $100.00 a while back. check their website and see if they are still doing exchanges.