Q: Switch Apple Watch Sport Bands

Hi

You can certainly ask in the store, but I'm afraid that no-one here can tell you what Apple will decide (this is a user-based community - you are not talking to Apple here).

Your band (if purchased separately) or watch + band (if purchased together) may qualify for return or exchange under Apple's Standard Return Policy:

http://www.apple.com/shop/browse/open/salespolicies