I just fired up the LE and did some comparison..
Full version has more sound.. for example in the basses category, LE=30, full=80 patches. The keys, LE=14, full=70plus.. Also some new categories (05-splits, 07-bells, 09-drums).. but each of the new categories only has 3 to 10 new patches.
You get a whole new effect section the LE lacks.. After the E1..E6, there is also a global step generator with independent left / right steps setting.