there were definite differences. the 4ft model had raised panels, a different deflector, shape changes to the neckm and the spine was different. the color also became greyish hues rather than green and blue. Also, the secondary hull was a bit narrower and taller. Overall, the ship just had a more staunch look to it. Oh yeah, and the port nacelle was pointed a bit down, but i took some artistic license and fixed that. lol