By "zooming" do you mean Scaling, like when you create a pan & zoom motion path over a photo? (You generally don't Scale a video clip, since doing so will create a pixelated image, since you'll blow it beyond 100% of its size.)
That said, yes, motion paths (Scale and Position keyframes) perform virtually the same way in both programs (and After Effects too).
Yes, zooming = scaling. In PE9 I'm doing it via the Crop Effect, using the ZOOM checkbox.
Thanks for the answer!