Ultimate magic spells for Dread Necromancer

[InfoStorm]

Reading through Ultimate Magic's spells again and a few spells to me scream as being one that a Dread Necromancer should know. We have one in our current campaign.

Do the following spells unbalance the Dread Necromander as a class?
Decompose Corpse (1st)
Rejuvinate Corpse (1st)
Lesser Animate Dead (3rd)
Undead Anatomy 1-4 (multipel levels)