Well, this is the USAF version box art photo for the 1/35 Panda model, and I have the instruction sheet here, but don't know how much help it will be -- most of the color references are for "Mr. Color" and "Aqueous Hobby Color" paints (Japanese/Chinese?) and only one FS number.
Panda calls the base color "off white" --Mr. color #69, Hobby Color #21
They list the camo colors as:
"middle stone" Mr. color #21, Hobby Color #71
"field gray (2)" Mr. color #52, Hobby Color #48
"olive drab FS 34087" Mr. color #304, Hobby Color #304
So, take that for what it's worth. I have no idea what "middle stone" is, maybe the brown color?? At least the paint numbers might give you a starting point to reference them with some other paint manufacturer. Hope this helps.