SRM5.0 with MDM Catalog

Hi,

I would like to know following questions :-

1, Do I need to replicate/bring master data (vendor, product category, material) from ECC6.0 to MDM Catalog if I need to implement MDM Catalog? Already SRM is having master data (replicated from ECC6.0).

2. I believe in CCM2.0 I don't have to replicate master data and just need to upload catalog. CCM was able to use SRM server master data,

3. My client is usuing MDM extensively and when we go for MDM Catalog, will it be totally seperate system from MDM SAP they are usuing?

Thnaks,

Rajan