Marc:
I used a color called French Khaki in the old Poly-S line. It is a lighter green with more yellow to it than the colors you mentioned.
On the Romania WW2 forums ( worldwar2.ro ) there was a discussion several years ago where it was suggested that there was a standard green color in the Romanian army in the pre-war period used on almost anything made of metal (as you earlier noted, during the war much material was left in the color it was delivered in by other Axis nations), and as a result the helmets were the same color as the tanks as the …
So I looked at a variety of color photos that showed Romanian helmets. I found some that showed Romanians and Germans together, and the Romanian helmets appeared notably greener than any of the kit in the hands of German soldiers. So I settled on French Khaki as the closest color.
And then used it also for my tanks and whatever, except of course I then painted a bunch of other kit in other shades of green because, well, I wanted it to look a bit different.
This is a pic of some of my Romanian infantry -- in this case a flame-thrower team. The flame thrower itself is a kit-bash based on a GHQ Romanian Individual Infantry advancing rifleman figure. It is meant to look like an Italian Lanciafiamme M35, which the Romanians used in some numbers.
Of note in this pic -- the helmets are the Poly-S French Khaki, while the flame thrower tanks are Poly-S German Uniform Gray-Green. If you look to my prior image of the tanks, the Open trucks with the tank company are in Testor's Model Masters Olive Green.
In this pic of some of my Romanian AT guns (in this case 75mm Pak 97/38s), the guns and the Laffly W15 prime movers are in French Khaki, while the Sd.Kfz.15 prime movers are in Panzer Grey.
So yeah, not quite a standard green, as some stuff is other shades just to keep things interesting…
-Mark
(aka: Mk 1)