@Bob77:
Wolf, would you say the yellow green is an exact, close or close enough match for the chinese? I want to get them their own art.
An alternate approach, just in case this option is something that would work for you, is to provide China with artillery that’s a unique shape, even if the colour doesn’t quite match, by giving it artillery pieces from A&A WWI 1914. The British Empire ones are, I think, the closest match for the green of the A&A Chinese pieces. The antiquated look of the WWI artillery piece is actually rather suitable for China in WWII, since the Chinese didn’t exactly have cutting-edge technology. And to supply China with a distinctive fighter, use a green American P-40 Warhawk from A&A 1941; it was the plane which the Flying Tigers actually used. Officially the Flying Tigers were a unit of the Chinese Air Force, but its pilots were American.