looking at my shop manual all the pulleys seem identical. the layout is significantly different and there is one more pulley on the ZX2's Zetec... don't know why.
Here's a comparison:
ZX2 2.0L Zetec, Belt routing and pulley placement (With A/C):
Focus 2.0L Zetec (All Body Styles), Belt routing and pulley placement (With A/C):
The water pump, alnternator, and crank pulley appear to be the same on both engines. Doing the installation will vary some though. if in doubt, call and ask, I guess!