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The spell reads:
The target’s bones or exoskeleton shiver and splinter, dealing 1d6 points of damage per caster level (maximum 15d6) to the target, who is also exhausted for 1 minute per caster level from the pain and exertion of the transformation.
If the target makes its save, it takes half damage and is fatigued rather than exhausted. Objects made of bone, chitin, or similar material take half again as much (+50%) damage from this spell. This spell has no effect on creatures that lack both skeletons and hard carapaces.
Since it states that objects made of bone take 50% more damage, obviously skeletons would take more. but since undead are objects, would all undead with a skeleton take 50% more damage?
I do not believe undead are objects. They are a creature of the type undead. Skeletons would take extra damage but zombies would not.