In my review of this kit that can be found in the Aircraft review area, I stated what is different -
F4U Differences
I know a few of you are wanting for the F4U-1A/1D, and wonder if it’s possible to build a 1A/1D from the Birdcage kit.. The answer is kind of… but you would require some parts from the later release from Tamiya or another manufactures kit...
F4U-1 early/mid Birdcage to F4U-1 Late (-1A destination, not officially used till post war)
• Redesigned Bubble Canopy. • Antenna Mast fitted to Fuse, aft of Cockpit. • Pilots Seat raised by 180mm/7in (5.14mm/0.2in in 1/32 scale). • Lengthened tail wheel strut. • USMC F4U's lacked arrester hooks and had a pneumatic tail wheel. • USN F4U's had smaller diameter solid rubber tail wheel. • First to be able to carry a drop tank under the centre section of the Fuse. • Belly window was deleted on most airframes. • Larger Propeller
F4U-1 Late - F4U-1D
• Twin-rack plumbing for additional drop tank. • Underwing Rocket launchers/tabs (last 266 F4U-1D's)
Hope that helps... But as Matt said, I would wait, as I would expect something from Tamiya very soon.