I've been looking at the difference between the Super Z6 set I have with the Super-Z. With a long look I see that the coils of the Super-Z are actually thinner. The coil wires are actually thinner, and the diameter of the coils is narrower. I'm not sure how this affects traction though. The Super-Z is the SZ323 size, while the Super Z6 is the SZ131 size for a larger tire.
However, both install pretty much the same way other than differences in the connector types, and requite the use of chain tighteners to keep the cables from falling off.