I'll talk to Jim about the "Spec 19T" and the "19T 4300" motors. My guess is since the brushless motors are being built differently, the 4300 motor seems to be the next "19T" class. Meaning that they are building the 4300 motor in a similiar design as the Novak. Therefore theoretically it will have simliar power and feel characteristics.
I can try and get a locked down answer maybe by Tuesday.