according to derv doctor the internals of the engine are different, i was thinking about doing this to my van but they dont recomend it. its a straight forward swap though, find a TD out of a mk1 mondeo or any of the earlier escorts and there is no ecu to wire in. make sure its the 90 bhp engine though, (the one with the intercooler). its easy to make some reasonable power out of them too as you can adjust the fueling on and off boost and the boost itself. with a front mounted intercooler and a bit of fettling by someone who knows what theyer doing i have seen them making 150 bhp
i would highly recommend derv doctor, they fiddled about with the fuel pump on my n/a 1.8d a few weeks back and its a million times better. cant think of the website off hand but google it if u want.