Hi Sal,
FWIW, here's an original color photo of that vehicle taken shortly after its capture. Although the photo is faded and the colors have shifted, I think you can still make out the cammo pattern edges and spots.
My own interpretation of the pattern is that it's a soft-edged three color (dark yellow, brown, and olive green) with "ambush" pattern sprayed spots of contrasting colors (same three colors). If you look closely, the dark yellow areas are quite clear and I would guess that the lighter "gray" tones are the green and the darker ones the brown.
Also, you can see along the bottom edge of the hull sides where the fender-Schurtzen masked the original cammo colors. I would guess these hard-edged areas are in primer red. This also suggests that the three commo colors were sprayed individually over the primer red instead of spraying the overall dark yellow followed by the other colors.
However, as they say, "Your milage may vary..."
HTH,
Also I have found this photos that show 331 with what appears to be the spot camo
