True with a gear train, but no with a worm and gear. Just friction. Weight will increase the friction, but will not change based on direction if the worm/gear are properly designed. That is why they are so efficient.
I was taught that a worm drive is the equivalent of pushing an object up or down an incline plane, as a screw thread is involved..
If the load torque was always against
the direction of worm drive direction, then torque will be the same.
The load torque is in one case against the worm drive direction in the windup case, and with the worm drive direction in the wind down case.
Why do you need torque control on unwinding?
As the cable tension will be less, I would be more worried about speed?
The maximum torque is when you are winding up.
No motor torque when stationary, but cable drum torque still present.
Lower motor torque on winding down.