yup, piece of piss. just 3 wires that you have to worry about just go by the colours, should be fine. The sprocket may be a 428 pitch on the lifan, just be awear of that. As your ducar will be a 420 pitch.
Ive done this to my agb-29 but was dissapointed with the lifans performace compared to the ducar. So it all went crazy from that point onward!