I've seen the same phenomenon and wondered about mislabeling myself. I bought a Sedum from a major local nursery labeled simply 'Album' but it looks very similar to S. 'Cape Blanco' that I received in trade.

Another possibility could be growing conditions. My S. 'Fuldeglut', supposedly an improved variety of Dragonsblood, varies in color quite a bit depending upon where it's planted and the time of year. Shape varies slightly as well, with more and larger growth when given additional water.