You may want to know which Salesforce fields a specific Marketo field is tied to. Here’s how to check.
Admin Permissions Required
Go to the Admin area.
Click Field Management.
Find the field you’re interested in seeing and click the + to expand the mapping.
This is displaying the Salesforce API name, not label name.
The fields listed reflect data from the initial mapping only. They do not get updated after the Marketo/Salesforce sync.