Guys,
Have to remember here that, as MR points out, the markings provided in the kit are the determining factor on the accuracy of whether the underlying paint should be DY or PzGray. The markings supplied in the DML kit cover the following vehicles/units:
1.Pz.Gren.Div "LAH" 1943, veh 205
1.Pz.Gren.Div "LAH" 1943, veh 215
3./Pz.Regt. "Totenkopf", Pz.Gren.Div. "Totenkopf", Kharkov 1943
Pz.Rgt.GD, Pz.Gren.Div. "GroSdeutschland", Russia 1943-44
1.Pz.Div., Greece, 1943
So, the answer to Doog's original question and the relevant "accuracy" question on the whitewash comes down to the particular unit and vehicle that is being depicted. Pz IV G's were delivered in Pz Gray in the course of the second half of '42 and those particular vehicles would have had gray under the whitewash...brand new vehicles produced in the early Feb '43 period onward and delivered straight to the front (as MR points out for specific units that the kit does provide markings for) would have had the DY basecoat and whitewash over that. As MR also points out, many of these vehicles were delivered to the front already in whitewash over the DY vs. it being applied in the field and are remarkable for that fact as their whitewash is very neat and not at all "rushed" or hasty and the pics that show these vehicles being delivered support this semi-unique appearance.
This isn't wheel bolt counting or rivet counting for the sake of nit-picking, it's a question of accuracy tied to the unit and battle circumstances that this particular kit is aimed at representing. 
HTH!