The Douglas A3D-2 Skywarrior was in service for a long time. Even after it was no longer being deployed as either a Bomber or a Version, it served on as a airborne testbed for several different programs.
The mid-life A3D-2 looked something like this:
The pretty much useless 20mm tail guns had been replaced by the "dove" tail with Defensive Electronic Counter Measures (DECM) capability. Provisions for a refueling package in the aft end of the bomb bay had been added (it could still drop bombs). The JATO bottle attach points had not yet been taped over (and are not provided on the Trumpeter kit). Small fairings for DECM antennas had been added to either side of the nose landing gear well and another added on the landing gear door itself. However, the airplanes retained the original nose. This particular A3D does not have the inflight refueling probe but it would have had provisions for it.
The addition of the dove tail required a cooling inlet to be added to the leading edge of the vertical fin.
This is a picture of either brand new or fresh from overhaul A3D-2s.
http://tailspintopics.blogspot.com/2013/05/douglas-a3d-skywarrior-main-landing.html) Another detail associated with the Bomber are the two Air Turbine Motor outlets on the side of the fuselage.
There were detail variations even on the same deployment.
The A3D-2 on the right has a dark gull gray anti-glare area and the radome and DECM antenna fairings are all black. Another possible difference in the painting of these mid-life aircraft is the change to a white rudder. They were originally gray when the gray/white scheme was introduced.
Whether or not the airplanes had the cambered leading edge or original wing or the big or small fuel vent was strictly dependent on its Bureau Number. See http://tailspintopics.blogspot.com/2010/09/mighty-skywarrior.html