Far more involved than you think, firstly the inlet and exhaust are on opposing sides.

You then also have suspension differences as the Zetec-E (2L) is heavier, do a search on here and you will see where someone has listed all the different things.

To answer your question, yes, Mondeo MK1/MK2 1.8/2L is the same engine as the Focus etc.

The 1600 Focus (Zetec-SE) engine was launched with the Focus and shares nothing in common with the other engines bar the name.

Martin