It still does have a clicky sound when you shift. Mine is only mounted with the weak support that came with the shifter. I need to find a permanent solution to prevent movement when I shift.
Base dimensions are the same. The changes between the two are internal as well as the metal shifter handle.
I don't have first hand experience but the general consensus is the CSR shifters are a substantial improvement in feel and sound over their plasticky, clicky predecessors.
Nice work on that armrest/ shift mount. Very similar to what i built. You can see mine in post 567 in the setup and mancave thread. Sorry on mobile.