You have FS 34087 and FS 34079. Both are OD paint. The first one is greener and the second is browner. The way the FS paints are ordered the numbers each mean a different think. The first number is the gloss and then the color family. Then the specific color. If memory serves me.

Truth is during WWII Mfg's were given the color code that the Army wanted. It was up to each Mfg to match that color. As you can imagine such was not always the case. It was probably rare that two different Mfgs even had the same colors.

Bare in mind that many planes were repainted in field depots, farther adding to the color confusion.