Tojga, early OD tended to fade more than the later variety, and varied in the "Final" shade depending on where it was used. The B-26s used in the Med were sometimes repainted in the field. I've seen examples where the top of the aircraft is darker than the lowers. One photo makes it look like the upper surfaces was painted using brooms, it's that obvious.
The green splotching on the edges of wings and vertical and horizontal stabs wasn't always applied. No hard and fast rule that I know of. The green on yours looks like it was to cover repairs or worn down paint.