If you are talking fitting a pre-facelift bumper to a facelift car, then you'll need new lights and bonnet too.

If you are simply talking facelift (copper) 290 to facelift (non copper) 300, it should be a straight swap. But the only reason to do that would be damage.
 
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Just an update to this as someone has actually done it.

Turns out, the pre facelift lights will work with the facelift bumper. However a new bonnet and of course grills are required.
 
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