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Can I use the ID field as the external id field for upserts on contacts? (via data loader)

In an effort to not add duplicate contacts, can I export the ID field on contacts (along with the name and address). Then do some external database matching on the name and address, and upsert the data including the ID field? Or do I have to split the data into an update of the contacts I do have an ID for and then insert contacts that don't have an ID?
Yes, that should work.