I don't know about the new shorter barrel ones, but all the old "new model Super Blackhawks) (7.5") with the dragoon trigger guard have a longer (or taller, if you prefer) grip frame than the New Model Blackhawks. and the original Vaqueros.
Grips DO not interchange.
Blackhawk grips usually fit the Vaquero.
If your gun says "New Vaquero" on the frame, NOTHING else will fit it but New Vaquero grips.