Should the torque to fasten screw be the same to unfastened it?

Goodevening Santillian
(Loosening torque will be always higher)You require more torque than fastening.This is like moving a dead weight from zero level to take a move.

Actually you require less torue to unfasten it.

Those responses must have been disappointing.

Unless the elastic deformation in the longitudinal axis of the fastener has been reduced by an action such as vibration, heat, or material creep, the loosening torque will be higher than the tightening torque.

Tightening torque is measured while the fastener is being turned to be tightened (all the friction encountered is dynamic).

Loosening torque will be that torque necessary to begin the movement of a stationary fastener (the friction is static).

Static friction is always higher than dynamic friction.