Being located on either end of the same shaft you would get a balancing effect but I'm not sure that I would want to set them up that way. If the motrs were not connected to the same drive shaft then you would need either to have a flow divider or plumb them in series.

Many hydrostat drives use axial piston or bent axis type piston motors. By "regular" motor I assume you are wanting to use a gerotor style. Piston motors often are rated to run at much higher speeds.

The big thing is to match the GPM of the motors to the pump you are using. Also the rpm output ratings for the GPM capacity. And if run in series then both motors need to match the capcity of the GPM of the supply side. If run split then they need aprox half the GPM capacity of the supply.