Can I change the wiring harness for a ninety five geo metro automatic four cylinder

What is your question?

I put a 93 geo metro 3 cylinder manual transmission into a 95 geo metro that had a 4 cylinder automatic. How do I change the wiring Harness so it will work.can a 95 3cyl manual trans pcm just plug in to the 95 harness. The pcm for the 93 3cyl manual has only 2 connectors, the 95 wiring harness for the 4cyl auto has 3. Do I need the 3rd connector or can I just leave it hanging. How many connectors are on a pcm 33920-50G21?