I honestly don’t know that much about this, other than my gut feeling is swapping in an obd2 port wouldn’t do anything, meaning you’ll still have obd1. I think it was @someotherguy who recently posted that some(very few) 95’s did have obd2 though.
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Sounds like OBD 1.5 to me. Some 1994-1995's (and in my experience, not any gmt400's)I had a95 s10 blazer with obd2 plug from the factory. It was an obd1 truck. I had a cable for that combo that came with my aldl stuff so I could read obd1 data. They are wired differently than the obd2 computers. 1 year oddball and the only one I've seen. All the rest of the 95's I've seen were obd1 plugs