What is the difference between figure of merit of a galvanometer

What is the difference between figure of merit of a galvanometer and restoring torque per unit deflection for a galvanometer,
I got confused because both are denoted by ‘k’…
If there is any difference please explain in detail.

The restoring torque per unit twist is given as ‘k’ which is a galvanometer constant.

Figure of merit is given as ‘K’ which is defined as the deflection produced per unit current.