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You reduce sound vibration buy reducing its energy across multiple frequency s.
Each change in density is a step change in which energy is lost.

So having to pass from (the room) air into plasterboard, though plasterboard, and then pass into air and then into rickwool insulation ( which is lots and lots of solid fibres separated by air ) and then into plasterboard and then into air in next room has one extra interference layer than having the rockwool sandwiched in.

Over squashing the rockwool reduces the air hole sizes in the rockwool, reducing its effectiveness to reduce noise

But I bet an air gap does not make much difference in a real world (like my house where I have done all the above) where the sound goes through the bathroom door, or across the studs (as I did not in-step them).

However, do do as much as you can as every bit does help a bit to reduce the noise, with the understanding that you can never remove it fully.

Finally, are you using high density noise absorbing plasterboard?
Sfk

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