Yes, you should be able to exchange the Green Alpine loop band that you purchased separately for the correct size. Generally, Apple offers a 14-day return policy for most products purchased through their online or retail stores. However, if you have already passed the 14-day return window, you may still be able to exchange the band if it is in like-new condition and with original packaging.
To exchange the band, you can visit an Apple retail store or contact Apple Support to initiate the exchange process. You may be asked to provide proof of purchase, such as a receipt or order confirmation email.
It's worth noting that exchange policies may vary depending on your location and the specific Apple store or retailer where you made the purchase. Therefore, it's always a good idea to check with the store or contact customer support before heading out to exchange the band.
Overall, as long as the band was purchased separately and is within the return window, there should be no issue exchanging it for the correct size.