In comparing the Dance with one of my Pietta 1851's, the frames are the same with two exceptions. First, of course, is the lack of a recoil shield, and second, the water table is milled slightly deeper to accommodate the larger Dance cylinder. Otherwise they are the same.
The Pietta Dance is not historically correct, however, as the originals had a frame the size of the Colt Dragoon. The cylinder was shorter than the Dragoon, being the same length as the Colt 1860 Army, which made the Dance slightly lighter than the Dragoon.
RC