In that second brushless motor you linked to, there is a guy who has posted the following review:

Will not be using this item for a couple of weeks yet, will leave a review when I do
and then proceeds to give the item three stars.

Don't some people realise that reviews and the product score form an important part of research for people interested in buying? When every other review gives it five stars, why give it three stars and tarnish the overall score when you haven't even used it yet and plan on reviewing it in a couple of weeks? Jeez, some people are born with pish for brains!
Sorry, rant over.

Anyway, I reckon you're probably aware of the fact Ben but just to clarify, the Graupner motor won't be able to be used with the brushless ESC you linked to and the servo board won't be able to control the brushless motors.
The servo board will probably even be too weedy to control the Graupner motor.