No you won’t be able to plug a Zetec ecu into your loom.
There are lots of combinations depending on what donor you get. Pats and pre Pats eec-iv and eec-v 60 pin and 104 pin.
There is lots of info on line for all flavours of Zetec from the 1.6 se to the 2.0 turbo Focus Rs all on Oem management but I have no idea on info for the 3i loom.
my advice for a 2.0 Zetec on Oem management would be a mk1 Focus as these are coming up 15 years old and you will find it easier sourcing sensors and stuff.