according to our wiki, the focus fk-2001 is a white alps board. That means it has a built-in click in addition to the botom/topping clacks (and in addition to the tactile bump).
The at101w is a black alps board. It has no click; it only has the topping/bottoming clacks and the tactile bump.
The M1 is also black alps. THough its a slightly different type of alps than found on the at101w, its behaviour will be very close to the at101w (that is: no click, only topping and bottoming clacks, and tactile bump).
So to answer your question, the M1's sound level should be closer to the at101w. It may have slightly different acoustics but it should be closer to the at101w than the fk-2001. That said, the topping/bottoming clacks on all of them can get loud even without any built in click.
If you're looking for a quieter alps board you can consider putting the aekII dampened-sliders into any of these boards. THose will greatly reduce the topping/bottoming clacks.