So just picked up this 93 pickup 22re auto. Was trying to get it to start but realized one of the wires for the efi main relay was missing. Traced it back noticed it was burned all the was across the radiator support. Wanna just replace that part of the harness instead of trying to splice shit together. Are there any differences in wiring through the years. Heard some say yes but need to know for sure

 

There were changes over the years I think. Mostly for all the sensors and stuff that were added to the engines as years progressed - but I think all those come off the firewall area (at least on my 93 most of them do). Look at pics of an 89/90 22re vs a 93/94 and you'll see what I mean.
For that section of wiring you're interested in I'd imagine it will be the same. Probably best to stay within a narrow year range, closest to yours, if pulling from a parts truck.

 

My 91 fuse box is a little different than the 93 so that's why I was asking. My buddy might have a line on the harness I need from a 93 just waiting for his buddy to confirm