Andy,
Yes the BASIC gear on the DDay troops was the same, HOWEVER a number of your DD-series figures have items that limit their flexibility. 1) The few photos that I have seen of US paratroops in the desert show plain helmets or daubed with mud, not the nets so common on the DDay figures, and definitely NOT the helmet-mounted first aid kit. 2) Your recent Rangers are shown strictly as assault troops on 6-6-44 with their gas mask cases, "wet" paints, etc. 3) Some of your DD-series have M1943 field jackets (like the mortar crew). These jackets didn't see service until Italy. On the good news the troops are marked for the 3rd Infantry Div which was in support in North Africa, but was nowhere near Normandy. 4) All of your recent vehicles are later versions and are not applicable for North Africa. The old jeep and open halftrack are OK, the later version 2 1/2-ton truck and 3/4 ton truck are OK. The recent M3 Scout Car actually BELONGS in North Africa instead of the Battle of the Bulge, so a quick repaint fixes that.
So there are a lot of growth opportunities for "An Army At Dawn" series.
Gary