This is probably not the right forum for your question. You should try
www.rcgroups.com and the power system discussion.
That said, unless you wind the motors yourself and make them matched in every way, you cannot expect the brushless motors to output the same amount of power. If you are running them off the same brushless ESC, it will be worse. So to make them work the best, try to get two matched motors and two matched ESC. Better quality gear, more $$$ may be required.
Matching brushed motors is a little easier and you can usually run them off a single ESC.
-- ggunners