I play New Vegas so seldom that I can't even remember how the Super Mutants are in it. If I understand it correctly, they are much tougher than the ones in DC and without using the Super Mutant Rebalance, the DC Super Mutant will be as the ones in Mojave, i.e. much tougher. In short, the Super Mutant Rebalance makes it so DC Super Mutants are as in the vanilla game, but doesn't touch the Mojave Muties (so they are as in vanillla as well)?
The reason I ask is that I kind of like the tougher Super Mutants in DC. Doing Museum of Technology at Lvl 8 was quite a challenge - by far the toughest time I've had with it (and it is rather tough with FWE/MMM in FO3 as well).
In short: without Super Mutant Rebalance, the DC Super Mutants are as tough as the Mojave ones, right? Which mostly seems to mean higher DT?