I'd say no.
I think people are getting a bit confused here...
You can have silver top engines in Zetec-E format, as in the MK5/6 Escort and MK1/2 Mondeo, in 1.6/1.8/2.0.
Black top Zetecs as fitted in the late MK2 Mondeo and the Focus, in 1.8/2.0 format.
Then the 1.6 Zetec SE as fitted in the 1.6 Focus and the Zetec S Fiesta and some Puma's too. That comes in black top and silver top form and is totally different.
Not sure on mounting a 2.0 Zetec in a MK4/5, I've never seen anyone do it. Quite surprised to be honest, considering how cheaply you can buy the engines. Everyone seems to go down the Puma engine route, even though the engines seem pretty pricey in my experience.
Sorry, I haven't been much help have I
Good luck with it though, be nice to see it happen, that's probably what I'd fit in one given the choice
**EDIT**
Incidentally, in a bid to be slightly more helpful, I know someone who has fitted a 2.0 black top from a Focus into a MK6 Escort by modifying the engine mount, so perhaps you could use the mounts from a MK3 Fiesta 16v (like an Si/XR2i 16v/RS1800) and adapt those to suit the black top.
Not sure how you'd go with the gearbox side of things as I'm not sure what type of box mounts the MK5 fez uses. You'd need a rear mount start box though, as all black tops suit rear starter I believe.