In vanilla Skyrim, reanimate scrolls are much weaker than reanimate spells, in terms of how high the level of the target can be reanimated:
This mod brings up the power of the scrolls to be exactly as the spells
Unofficial Skyrim Special Edition Patch changes are forwarded, but it is not required.
Spell Scroll
Raise Zombie 6 4
Reanimate Corpse 13 6
Revenant 21 9
Dread Zombie 30 12
Dead Thrall 40 15
This mod brings up the power of the scrolls to be exactly as the spells
Unofficial Skyrim Special Edition Patch changes are forwarded, but it is not required.