Is there a difference between the two? I know that both of them are made by NPR, and it seems that both have part number (my 84mm Supertech rings say 21-GNH08400).
Only reason for asking is I ordered Wiseco and got Supertech, and I don't want to deal with exchanging them if they're literally the same thing with just a different sticker on the top of the box.

 

They are the same and that is the only high performance ring option. All of the aftermarket forged pistons ( cp, st, wiseco, JE, Malhe) use the same ring pack.