Downloading countries and postal codes

Hi Friends,

In ECC, we have maintained countries and postal codes that are required from ECC transaction perspective and we didn’t replicate countries and postal codes from ECC to CRM.  Now we have requirement to load missing countries in CRM, some countries are missing in ECC and CRM.  Is there an issue if we just load those countries in CRM only, if we don’t have a need to load those countries in ECC or is it recommended to load in ECC and CRM at same time.

Please help me on this and clarify it.

Thanks and Regards,
Venkatesh