The oil drain pipe is different and so is the block connection. The push in block connector is about £1 but th epoxy pipe is about £30

The T3 is by far the best turbo to put on the Fiesta, I just don't get why Ford didn't do it in th efirst place.

If you have half an ounce of DIY talent you will be able to do the conversion. The toughest bit I dealt with was mating an Escort doenpipe to my FRST system. My bro soon sorted that out with some spare stainless and his welder