Quote Originally Posted by lord_eru
Alot probably. The scripting, modelling, skinning, map, government system. The 2D art can be reused, including the ancillaries, as well as the campaign models (I think), and the descriptions.
Modelling and skinning will have to change, because now things work differently IIRC and there is the whole needing multiples of each type of shield, skin, etc, etc so that you don't get the clones.