Couldn't get a solid answer from anyone there. No mechanics in on the weekend. One guy tried telling me that they are different resistance and amp draw, blah blah, I then started zoning out. I told him guys swap out the headlight relay with the fuel relay in a pinch to get home and it works. I said how can they be different if 3 out of 4 on the relay holder have the same part number. It's a fricken relay. I stumped him with that question and carried on my way.