Exactly what do you want to know ?
Both motors should have the same wiring unless one had a powered timing trigger ( SAM ) .
So pull the blower housings off both engines, note where each wire went to on the old one , lable the wires on the mower side of the plug.
Then make sure the m=new engine wires from the same items goes to the same place in the plug a the old one did .
If you want any meaningful details then we need full model numbers and better still some photos .
Mechanical pumps or gravity fed or impulse pump makes no difference to the wiring .
