The -200 is higher powered and heavier than the -100, and also incorporates a couple of systems upgrades. Basically the engines are -300 engines, but derated. Not flat rated to the same max power as the -100. The derate is above the SHP of the PW120 on the -100s. I can't remember the actual numbers, but the -100 had a little over 1800 hp per side, and the -200 was over 2000. Performance was worlds apart. The -200 was fun to fly, the -100 was a pig.
flights showing up as DH8B is an error. They don't have any -200s left in the fleet.