whats the difference?

whats the difference between a dash-8 40b and a b-39-8e? ive looked at a lot of pictures and cant figure out the difference. i it internal, like a different prime mover?
Thanks
GEARHEAD426

100 horsepower!

Thats all I know… LOL

from a engineers point of view is the engine has 100hp and slip control is better on the dash 8 and 9s other wise they still shake them selfs apart in a year or 2 you cant depend on them to get where you are going but you can depend on them to catch fire regularly.