No that is not the norm, to run 2 motors from ( 1 ) Drive, the drive would have to have the capacity and designed to do that, so you would not save much by trying this, the reliability could be the main issue
Are yes you can run 2 Drives from a single Breakout Board output, there are Breakout Boards that already have this feature.
If you use a right hand and a left hand Ballscrew, then you would not have to have any change to the wiring both Drives would receive the same signal
If both Ballscrews are the same then you have to reverse the signal to ( 1 ) of the Drives