Thanks, Eric! Yes - it's implemented as an SF Person feature. When a Lead is converted, it creates the Person Account (_c and _pc records) and both update in-sync. The problem is, the API calls will happen when Contact record is updated, then the Account record is updated and Marketo will call again. So it duplicates API calls. I wonder if it's possible to limit to one type of record, e.g. "RecordName_c".
Any experience with that?