Yep . that is very likely. However I would like to make a focus on the pics above. It can be noted that the flap leading edges were painted before the flaps were attached. IMHO it was because later, after mounting, it would be difficult to apply the paint without getting the wing interior and hinges dirty. It was done more or less. Sometimes more surface of the flap was painted , sometimes less. The three first top images above show it nicely.