ecu and ezk can generally be from different cars, they are quite forgiving.
the lh2. 4 ecu has a bigger connector, 32 or 35 pins. lh2. 2 is smaller, maybe 25 pins.
the tps wiring is a little different, think the turbo does not have wot switch. a wiring diagram will tell. also the amm is usually on the other side of the engine bay which causes a little pickle. a 740 turbo airbox can have its under half cut up to fit the 240 engine bay for a factory look.
i have the chips for the ecu. only a couple of chippable ezks left here which are spoken for, though i could make one up (expensive, better to find one already done). if you have the coin a few hours on a dyno is by far the best option for tuning.
i would suggest get a turbo ecu and ezk to get it all going then wind it up and chip it after it is run in.
btw, given the choice, go for an ecu with a 900 part number before a 500.they are newer and allegedly better responding.