by nekobat
They have different backings so sleeveing will be required.There is different terminology, but as long as you know the terms that's not that big an issue.
Villain = Enemy
Hero = Ally
Equipment = Artifact
Superpower = Maneuver
Super-Villain = Archenemy
Punch = Courage
Vulnerability = Despair
Weakness = Corruption
The bigger issue is more that the cards are balanced slightly differently. The Super-Villains only go to 12 in DC, but 14 in LotR, so the LotR cards give you slightly more power.