Well there will be no harm in trying the dasmikro if you have it. Admittedly the only wiring information is on the web page where you buy it. It is a bit vague as ive known some people to try and connect VCC to VCC servo at some point in their system. Make sure not to do that

If you are unsure draw your a wiring diagram and post it here and people here will give you a verdict on it.
And yes that is correct about the vex. Obviously you will have to solder motors to it as well.
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