According to https://www.macrumors.com/2015/04/22/apple-band-only-apple-watch-exchanges/:
- The new band must be within the same collection as the watch and must be an available band option for that watch face.
The black Sport band isn't an available band option for the silver aluminum face.
Tell us about it. Those so-called "Apple Specialists" also informed some members that the Sport comes with two full sets of bands and that AC+ doesn't cover the out-of-the-box band.
They are definitely misinformed. 2 days after launch day, I went to the Apple Store to put AppleCare on my watch. While the guy was ringing me up, he asked if I had heard about the band swapping program, and explained that I could exchange my band for any other Sport one. I have the Space Gray, and he obviously knew that. I asked if I would be able to get the Blue if I really wanted, and he said "of course".
I wonder, had I done it, if I would have been able to actually go through with the swap?