SuperX, DoubleX, and HV (Supreme) were all copperplated. The differences were mostly in the shot weight. For instance, for 12ga, 3" shells...
SuperX - 1 7/8oz
DoubleX - 2oz
HV - 1 3/4oz
The stated velocities reflected the differences in the playloads. The "Supreme" label showed up on multiple versions, so it was not a good indicator of model. The product numbers remained the same, though. Hull colors helped identify them, too. For instance, SuperX and DoubleX usually had red hulls, while HV used black ones.