The Vaquero and the New Vaquero are two different sized guns. Some parts interchange and some parts don't.
The Super Blackhawk hammer is a "drop in" on the Vaquero. Since the New Vaquero is a bit smaller there may or may not be some "relatively minor" fitting required. I dunno since I've not attempted the procedure.
The lower, rear semi-circular profile of the Super hammer may or may not match the profile of the "pair of grip frame ears"......
Still, there shouldn't be anything that prevents the swap from being doable!
JMHO,
flatgate