Can you use back motor differential to turn convergence type model with 2 coaxial motors in back?

Hi, I am developing a tricopter convergence type winged tiltrotor aircraft with 2 coaxial motors in back and 2 tilt rotor motors in front. Does anyone know if it is possible in mission planner to use motor differential in the back motors to turn the vehicle? Currently I am asymmetrically tilting the front motors to turn the vehicle. But since I have more power in the back, I prefer to use motor differential in the back to turn the vehicle.
Thanks.

Using the coax motors will almost certainly provide less yaw authority

Good point. But I would still like to try to see what it can do.