MOTM

In each of the modules I've received to date, there are two types of pots.
I don't have them in front of me, but I remember them being by Burnes and
Spectrol.  One gets surface mounted on the PCB, and the other gets connected
directly to the front panel (I don't recall which is which).  I can
immediately tell the difference in the action of the one module I've
constructed to date... the PCB-mount knobs are firmer and more pleased,
while the faceplate-mount knobs feel rather loose.

Is there...
1) any reason why the two different knobs are used?
2) any reason why I couldn't pick up a few spare PCB-mount knobs and use
them in place of the faceplate-mount knobs?

Thanks!!

--PBr