I'm on vacation/holiday so I don't have any of my reference materials here. But as Rob said in the middle of a war you're probably a little busy to go back and repaint everything.
I do remember some odd cases were found here and there though, like the yellow stripes that were supposed to be stopped early in the war being applied to some late war vehicles. So I'm not sure it's totally impossible that even newer stuff may have been painted in some cases with older camo patterns as well.
BTW Rob, great article there, I'm going to bookmark it just for the paint chart.