They are different. I think I saw 696 here on the board had an adjustable fuel pressure regulator the other day for sale. You might want to look that up.
i had both but now i just a afpr its a stock one thats been modifed and it works great and looks good. and yes the adj wastegate rod is different on a 84-85 vs 86-87 let me know i can send pics. 50.00 shipped.