When changing the rotation of 3 phase motor, does it affect the cooling of the motor?
Some three-phase induction motors have an external cooling fan mounted on the motor shaft opposite the drive end. In my experience, that fan always has straight blades that move the air by centrifugal force and is equally effective when operating in either direction. Induction motors usually have fins on the ends of the rotor that are straight and move cooling air through the rotor by centrifugal action and are un-effected by direction of rotation.

If you have any type of three-phase motor of a design that would prevent proper operation in either direction, that fact would likely be clearly indicated on the motor.