The system by default is designed to check using the ID. Changing this would require code changes. In the import Step 3, under the advanced options, there is something called 'Verify duplicate entries against selected indexes'. This is for when you want to import new records into the system, but do not want to import data that might already exist in Sugar. So this allows you to check by Name or email etc. If the import tool finds a match from your csv to a record in the module within Sugar, it will not create the new record. If you have not already, you can read more about importing data
here
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