you can switch all the ecu around-with main difference being the tps/wiring has to match-the green labelL8 ecu is also for unleaded lambda control iirc
is everything connected-tps,coolant temp sens,ait,map,crank sens[gapped correct too]
sensors are so cheap nowadays i would pop a full set of new ones on in any case
what ecu do you have-and is the fitted chip correct for the injector size-that would maybe be a good start lol