Ed,
I think that indeed SAP Digital CRM is the same as SAP Digital for Customer Engagement (SAP D4C for short).
SAP D4C is the 'little brother' of SAP Cloud for Customer (SAP C4C for short).
SAP Customer Engagement: SAP Digital for Customer Engagement
SAP Customer Engagement: SAP Digital for Customer Engagement compared with SAP Cloud for Customer
As far as I can see, integration in D4C is limited, and would require the 'bigger brother' C4C.
If you would like to get more information, also check out the Cloud for Customer group here on SCN.
Regards,
Pieter Rijlaarsdam