I built the Trumpeter Type 87 and used and earth brown color as the base with a medium green and a dark green as the other two colors. I looked at and saved several photos to be sure of this combination. I have seen some variation in colors and camo scheme with PLA equipment. I recommend that you find a photo you like and use that as a reference to paint your model. Or, you go Iraqi and just paint it desert sand. HTH
If you remember that photo of the man in front of a tank at Tiananmen Square, it is in color and it came out in several magazines like Time. It show chinese tanks in their livery.