I’m not sure if you’re talking about the A&A board games or the A&A miniatures product line (you mentioned Global 1940, but your post is in the Miniatures section)…but in case this is of any help in answering your question, one of my unit identification charts includes a colour table. Go here…
http://www.axisandallies.org/forums/index.php?topic=31982.15
…and then scroll down to “Reply #22 January 08, 2014”, and then click on the chart labeled “Player Nations and Unit Colours WWI & WWII.jpg” to expand it to full size. The colour for China is in the bottom right corner of the chart.