Looks like they just used two identical straps. Get two short straps in the same style.
But why do that? One watch will be dinged up. I’d much rather wear one watch on each wrist.
[doublepost=1513976990][/doublepost]Ok. Looking at that more, those appear to be custom short straps (or a photoshop). If you do enough searching, you can find custom strap makers. But then one set of straps needs to fit the Apple lugs, and the other standard spring bar. Of course, in the right widths for both.