This version is based on Ralph McQuarrie's original concept art for the "Flying Hamburger", as seen below. The most noticable differences from the movie version include; different cockpit design and attachment method, different "radar dish" design, different engine baffle design, much larger guns with only two barrels each, lack of soot covered exhaust stacks above engine area, lack of maintenance wells in the main hull, much larger and differently designed cargo areas underneath engine area and the addition of cargo clamps to the bow mandibles.
Reguarding the existence of both types simultaneously in a gaming environment; I like to think of this version as simply being the equivalent of an earlier year model of the same vehicle. For example; a 1973 Chevrolet Camaro and a 1974 Chevrolet Camaro. They're both Camaros, and are essentially the same vehicle, but differ slightly in cosmetic appearance. (Special thanks to Mad Mike's Camaro and Chevy Information)
During development
Finished Mesh Renders
Textured Renders