Healy
I think you'll find that the Dash 100 has the PW120A, Dash 200 has the PW123C and the Dash 300 has the PW123E for their models. The 300 has the same engine as the 200 more or less but the 200 engine is de-rated and is quite nice to fly compared to the 100. Yes the 200 is used mostly on LHI for it's speed (280-290kts TAS compared to the 100 250-260kts. Makes it 30mins faster on the return trip to LHI) better payload with there increased takeoff weight.
Hope this liitle bit of info has answered any questions.
