ECU Differences ???
 

Recently purchased a damaged 88 SV21 Ultima & I'm wanting to transfer dash, sound system, electric windows, central locking & cruise control over to a 92 SV21 Executive.
I have changed the dash & dash loom, the loom behind the dash, the h/light loom & have the door looms. All that is left is the rear loom, the interior lights loom, & the main engine loom. I am not worrying about the interior lights or the rear - the main engine loom is what I am raising a query about. I notice the parts number on the ECU differs slightly & whereas the pin numbers are the same - there is one less wire in one of the plugs.
I was hoping I would not have to change the main loom & ECU - does anyone know if it is necessary for me to do so?