Switch Apple Watch Sport Bands
Can I switch out my new sport band with another sport band of a different color? (In the store)
Apple Watch
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: