You have to use the CCC unit w/NAV for it to work with the larger screen as far as I know. It will physically work with the MASK, but my understanding is the picture only shows up at the top left of the screen. Anything beyond the original screen size just ends up being black, and the picture isn't centered so it looks like crap.
I found a good deal on the larger screen a while back and bought it thinking I would be able to use it with my MASK system, but after doing some reading I never even swapped it in
I've been searching for a good price on a CCC unit for a while--I found a kit with idrive controller, CCC with preset buttons and the plastic piece that covers the buttons HVAC controls, and screen for $550 a few months back when I first started looking and didn't buy it. Still kicking myself for that one