Nope! Just need to find which set is direct feed up from HU.
The new feed for door speakers will be from a seperate amp!
So I guess its a matter of pulling a set of leads and see which moves! 
Ahh right fair enough, well in that case, just cut both wires in the tweeter location, crimp them with speaker terminals and plug them in, there are only two sets of wires, so it's a 50-50 chance lol!