If you are talking about swapping the front clip, you have some work. Supposedly the Mondeo headlamps are deeper, so they might require you to modify your radiator support. You will also need headlamps from the Europe mainland, and not the UK. The euro pattern will have its upwards slant facing oncoming traffic here, which will probably get you cited pretty quick. You will most likely need the header panel to support the euro lamps. The grille is different, so is the hood. You will need a new crash bar as ours is too thick. The Mondeo pumper is different then ours, it has a dip for the grill to sit into. The corner lamps drop off quicker as ours have a more gentle curve. You will also need a hood, both front fenders (you need a set of Contour fenders too). The Mondeo is missing the bodyline that we have under the ding strips. To make it line up, you will need the lower sections of your fenders grafted onto the Mondeo pieces.
Its a lot of work. To my knowledge, noone has dared try it. Shipping is going to be a big pinch on your wallet too. For curiousity, I ran a rate check on UPS for you, pretending you are shipping a crash bar. Going on the dimensions of 60"x8"x6" (smaller then actual) and insuring it for $75, you will be spending more then $80 just in shipping. Fenders/hood/lamps will probably be less because they are smaller. The bumper cover is going to hurt though, just because of its size. When I shipped my 98+ trunklid from MI to UT, it was $100. That was using my family's business rates and shipping it through Overnite Transport. FedEx and UPS wouldn't even touch it.