Hey guys good luck there! If I may point out though it may seem a little strange but every Japanese company had a slightly different paint colour for the same thing- aka Nakajima navy underside grey is a little different from the Mitsubishi navy underside grey.
I wouldn't worry too much about it but if you're a stickler for detail you can find out if your Zero was one of the original Mitsubishi birds or produced under license by Nakajima - the paint will be slightly different. For one thing Mitsubishi interior cockpit green looks very similar to US interior green to me, Nakajima is much greyer and looks a lot like RAF interior green.
The interior of the plane and in some cases the wheel wells were left plain aluminum and then sprayed with a translucent varnish called aotake, it started as a bluish and over time aged to more greenish. Being translucent you can see the aluminum though it giving it the metallic blue-green look.