It's wasted spark and I think the current path is from a high tension coil winding, via plug 1, via head, via plug 4, back to the same coil winding. A circuit.
If that's the case then it probably makes little or no difference to swap around 1 and 4 or 2 and 3.
The current flow direction might be the opposite way around, but that maybe makes no practical difference if it's not going back to earth, but is going back to the same coil.
Edit...I didn't see there was a page two and that was already answered there.