Roamio Cablecard Questions (Comcast SF)

Hi all,



I have seen only spotty treatment on these forums of the following questions. Apologies if I missed it:



I am going from a Premiere with 2 tuners to a Roamio Pro. I am in the SF Bay Area with Comcast.



1. Does the same cablecard work in both? I believe the Premiere is using an M card.



2. If so, what must be done to move it over and pair it up?



3. If not, how do I deal with Comcast to get a new one? Can/will they charge me for making the switch?



Thank you!