I noticed on this walkaround set of pictures of the Japanese Type 95 car that one is lighter green and one is darker:
http://www.primeportal.net/trucks/yuri_pasholok/type_95_scout_car/index.php?Page=1

So do I assume that the light color is an Imperial Japanese Army vehicle and the dark green is the Imperial Japanese Navy vehicle? The dark green does seem very close to the spinach green on IJN aircraft.