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I'd thought the 2ltr would require more work as its a different engine isn't it?
Correct, Glenn they are totally different engines.
Your mate currently has a 'Sigma' engine or Zetec SE, this has nothing in common with a Zetec-E, the exhaust and inlet manifold oppose each other, plus it's heavier, thus suspension is different etc.
There has been a whole list before, but suffice to say there are several differences between the engines.
The 1.7 Puma engine is just a larger capacity engine than he already has, therefore it will fit as far as I am aware without any mods.