Yeah, it's the larger HP pool that makes the regen potentially stronger on a Tanker.
The resistance numbers would naturally better as well (guessing +30% for powers compared to a Brute. ~20-25% overall).
Plus the better ATOs (+18.7% S/L, +12.7% everything else).
That could mean the potential for at least capped S/L with F/C close enough for Scaling Resist to the cap them.
So here is an existing EM/Regen Brute at baseline operation before any big buffs like Rune of Protection, Moment of Glory, Instant Healing, Demonic Aura, Incarnates, etc.
I'm guessing @Spaghetti Betty may have even better numbers on theirs.