Nope.
Try to balance the classes but don't just give each spec the same skill. Variety is a good thing.
Sure, it makes balance harder to achieve but Kainzo & Team are up to the challenge.
Levelling as a necro I often wanted some way of restoring mana and now that I have finally achieved it (skeleton+unholyritual) find it to be buggy and awkward to use. However, I wouldn't want necros to have replenish. That's something unique to wizards, necros (and the other specs) should be different.
PS. balance will never, ever, ever, be perfect. there will always be factors (situation/lag/skill/experience/...) that affect our perception of how one spec stacks up against another.