They were sold with consecutive serial numbers in a two gun plastic carrying case. Perhaps they decided to split them up; its the first I've heard of it though.
These guns are new Vaqueros built on the "medium" frame so the cylinder is smaller than the one on the large frame Blackhawk. I'm pretty sure the .45 Colt Bisleys are built on the large frame.
There is a medium frame Bisley New Vaquero out there in Stainless and I understand its grip frame will interchange. The cylinder is fluted but it does have the Bisley hammer which is a lowered hammer just not as wide as the Montado hammer on the SASS Edition guns. You might want to take a look at those; here is a link: http://www.ruger.com/products/vaqueroBisley/models.html