They are different in front but you can still tell what is what if you go slow. When I did conversion I was able to match them up w/out a diagram but it took me a while.
Largest difference is the color of wires and/or pattern used on them. S also has 2 connectors for headlights, one with big wire (like single on naked) and other has small wire.
I think ignition wires are the same on both types.