Reply to MPD18/MPD26 same pcb?+mod help

so Im trying to mod my akai MPD18 pad controller.
I want to add a bunch of potentiometers and buttons and maybe a new fader, so I dont have to buy a dj controller(I do not intend to scratch anyway so I dont need jog wheels.)
my question:
is the main pcb on the akai mpd18 the same pcb as the mpd 32 and 26, just without hardware connected?
if so: is it possible to add hardware to the empty connections?
if not: is there an expantion board I can buy to add more controls?

thanks!