The crank posistion sensor and the oil return fitting are the only differences.

the oil return on the fiesta is threaded to join the oil return pipe of the turbo the escort is just a push fit, however they both just press fit into the block.

i removed the fiesta one in favour of a esrt type. as for the crank posistion sensor. I would imagine you could use a crank trigger on the bottom pulley to get away with using a efi style one.