The truly bizarre part of the OP's outlandish claim, is that we've seen the rubber band on both the Watch Sport & the Watch Edition!
Are we to believe that both the cheapest and the most premium one are engineered identically, with the mid-tier differing from them both?? Lol, that's laughable.
Well, the Rubber strap on the edition model is not the same strap as the sports one.
It had a gold button/stud on it.
So, they are not the same.
Whether they are the exact same connector is open for debate.
Honestly it would seem more trouble than it's worth to make the strap connectors different, other than the two watch sizes.
However this IS Apple we are talking about. THE Kings of locking things down and making sure X can't work with Y, unless you buy Z.
So, until it's actually released or the say more in the pre-launch event we are just guessing.
As I say, it would seem a pain, and would annoy people if they did have straps that did not fit some bodies and visa versa.
It would be silly, as they know, then, all it would do is to make 3rd party straps even more popular as some Apple straps would not fit your watch body, and it would be silly for Apple to do that.