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There has been a good deal of discussion of this subject on other threads, but nobody has been able to come up with a definitive answer. Most people simply assume that AW 1 bands are fully compatible with AW 2. I phoned Apple this morning and was unable to get a clear answer from them either. The expert said that he "assumed" this was so, but he wasn't certain, and consulting other people didn't lead to a more definite answer.
 
Yes

http://www.apple.com/shop/product/MM992AM/A/42mm-yellow-sport-band

Screen%20Shot%202016-09-07%20at%207.08.21%20PM_zpsmcuu6k71.jpg
 
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