a quick scan of the owners manual give these differences:

the 200's get 2 RF inputs on the rear while the 100's get only 1.
the 200's get picture in picture

The TV rear panels illustrated in this manual are for KV-27FS200, KV-32FS200 and KV-36FS200. The
KV-27FS100, KV-32FS100 and KV-36FS100; do not have the AUX input and TO CONVERTER output jack. (all referring to coax connections) i guess you could be playing 2 games picture in picture if you so chose.

the manual is here