dual potentiometer wired in parallel

Electrically yes they are. The ganged one can withstand a lot more power than the single, but that would not be an issue with the subsequent resistor values shown.

Mechanically though it would reduce wiper noise. That is, the effect of dead spots as the wiper moves across the resistor. Often heard as a LOUD crackle on audio systems as you adjust the volume. However, in parallel with 120K you would still see a significant voltage change when one or the other was on a dead spot.

Pretty close. Probably the CRV (contact resistance variation) will be reduced in the ganged version, and power dissipation capability may be different for different constructions, but those are minor points.

With the given circuit the maximum power dissipation is negligible compared to the capability of most any pot you can think of unless the loose end of that 120K resistor gets connected to some absurdly high voltage.

CRV reduction would be more of a factor on a low resistance cermet pot where it is typically specified as the larger of a percentage of element resistance or a certain number of ohms.

Short answer, yes. Potentiometers act exactly like resistors, so ask yourself, if you put resistors in place of the pot, would the equivalence hold?