Those look to me to be 1940 models. 1941 had the park lamp elongated ontop of the headlamps.
The mudguards are also cut out on the military versions so there is clearance for the bigger tyres of the military versions.
Top photo is also an American cab as it has no quarter light (vent) window at the front of the door window.
NOTE. on the photo below the GMHolden body with the vent window and also the marker lights elongated on top of the head lights. Also the mudguards have been cut out. I have seen pictures of these with different shaped cut outs in the mudguards as well.
Pic from the AWM data banks.
Cheers
Cliff
PS> Dodge 'D' series were cut out the same here in Australia as well.