Is there an ERD or document that details Entities that are linked? e.g CRM(Hubspot and Salesforce for instance),  Communication(e.g Slack and Email).

 

Case in point - CRM(Hubspot and Salesforce): Such a document would detail how the Companies table on Hubspot holds similar data to the Accounts table on Salesforce and would be useful in linking similar data entities.

 

Please let me know if you provide such information or where I can find it.