You can/will reuse the entire harness. Actually, depending on what you keep/delete you can get rid of about half of the wiring thats there (but thats another conversation)
Your 94 is one of the easiest year to rewire. Most of the pins are the same, some need to be moved, a couple added, and a few deleted. VERY simple, it just looks like a headache cause of the wires running everywhere.