I’m currently reading “The spirit of leadership” by Harrison Owen and it has something to say on the difference between management and leadership:
[Managers] control the system, whatever that system might be. And the operative word is control. A good manager makes the plan, manages to the plan, and meets the plan. The details are taken care of, the abberancies are controlled, and the problems are solved. … But when the balance swings to nostability and change occurs in radical, discontinuous jumps, the skills of management don’t work quite as well as they used to.

Which would make “change management” an oxymoron – there ain’t no such thing. A better term would be “change leadership”.