there is no ERG on the JDM motor also Water pump is also different. Please use the search feature of the forum. The question you are asking is well documented. Good luck and I hope you find what you are looking for.
JDM Supra vs JDM Aristo, nothing internally. Externally, there is no banjo bolt on intake manifold for the brake booster, no dash temp gauge single wire sender on the Aristo motors; front vs rear sump, different AC compressors, different Oil filter housings. Non-VVT-i motors have different water pumps and housings.
USDM vs JDM has been covered so many damn times that if you google USDM vs JDM 2jz, it will give you all the info you are asking to be spoon fed.