Mike:
I have that great coffee table book "Cockpits," with all the WW II...well, obviously, cockpits. Some are restorations, and some are unrestored, all are well lit large photos on good paper. You'd be amazed at how many of the various American fighters either unrestored or restored by reputable restoration outfits/museums have exactly the shade of green you have showed here. It's weird. We all think of yellowish-green or blue-ish-green zinc chromate type colors for aircraft interiors when, if you're in one with original paint, a great many of them are quite brown or OD looking, especially outside any direct light, and especially when photographed with modern film. Mustang cockpits have this trait. The P-59 was another. And the P-38 is yet another, though it has a lot of black in it. I first noticed this one day while playing around in a C-46 and C-47 awaiting their fate in a fire pit. Both were wearing the same paint they had on when they went to war, and though this was the late 80s, and it had faded, I pried off the placards in both planes as souvenirs, since they were to be destroyed, and the paint was pristine underneath. No fading at all. And still had that brown/OD cast to it. And the aluminum that skinned the wings gave great contrast because it was identical to MM Chromate Green. You don't start to see universally green U.S. cockpits until Korea, and right after that they started turning gray.
So this whole excercise, fun as it is to argue minutia (and admit it modelers, this is one reason we do this, for what is modeling but sorting out tiny details with our fingers, whether gluing little parts or typing an argument), is an excercise in futility, as John Dillinger said.