Actual plugs don't fit each other or wires in different configuration?
Even later vs v8 physically plugs into vn/p harness just need to re-pin plugs with small thin flat blade screwdriver into front tab & gently slide wire out back.
Also some harness will have extra pins on one side & not the other for either higher spec models or just stuff particular car doesn't have...only main difference I can remember is S1 have orange/red trace wire instead of red/black trace wire that was more common.
Trace the wires & match up were they go to be sure anyway.