I hate to argue with the master on this one, but I was just facing this issue and in my case they run the car differently...
Using a '93 240sx, Wiring Specialties pre-made engine/transmission harness & redtop S13 sr20det engine.
The car runs perfect with the 62 ecu.
Swapped to an E5 ecu and I have a noticeable misfire, and no tach signal. Those were the 2 things I immediately noticed.
Just to forewarn some people.
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