Hard reset only clears learned memory it doesn't change the actual base programming which is different based on the engine and vehicle parameters. In this case the injector and spark programming would be different as would the shift points and pressures in the transmission at the least. If the gearing or even something like the ABS programming was different it would alter the ECM and TCM programming.
It wasn't as bad as the parts are now but even 20 years ago parts interchange was becoming a problem.
Tuesday, December 20th, 2022 AT 5:43 PM