Email Audio Plus Services if you want to get info straight from the horses mouth (North American distributor). To my understanding in the Passion line the 100, 200, and 300 are the designations for the integrated amps (each giving you more power). I don't know if you have been to the YBA website (it's not easy to find) but they have a comparison feature that allows you compare any model in the line to another.
http://yba.fr/uk/index.php
Good luck!
http://yba.fr/uk/index.php
Good luck!