That title should read AE CS4 not AE 4 sorry..
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Path animation on a mask or shape layer path would be the equivalent of a shape tween. Still, if you adapt your way of thinking, you can use various distortion effects and opacity animation to create invisible transitions. There's a Reshape filter and CC Warpomatic for instance. Depends on whether you prefer a clean look and actualyl placing everything neatly or if some munched pixels inbetwwen are okay by you...