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I think there shouldn't be any problem with these, 9 pins are actually 3 +5V pins, 3 GND pins, 2 signal pot pins and 1 button =) Just solder 5V and GND together (they may be already connected internally, check that,in this case, just use one of each!) and bend/cut pins so they will fit into the box. If you decide to build the B8 stick grip later, 9 pins can be a problem there, most likely there wouldnt be enough space for them (you can still desolder them and connect with wires).

I have updated the assembly manual for 412 head recently: http://hc625ma.org/ab412-collective-head/ , check it out!