If you're sticking with the same engine (like 7MGTE for 7MGTE) and swap all of the components over from your US engine onto a JDM engine, you can run your US ecu. The engine mechanicals are all the same, JDM engines just have different smog controls, which is why if you didn't swap it all over you would need the ecu.
Keep in mind that there are some differences between engines before 1989 and engines after 89. Easiest way to tell what year the one you get is to compare the oil pan from yours and the JDM one.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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