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I'd do this in SFDC using the Lead or Contact ID # as the matching method.
You might be able to do something similar using the Marketo ID, but test that on 1 record first.
Another option would be to create Smart Lists in your Lead Database. Each rep should have their own smart list dictated by "Lead Owner Email Address". Then, one rep at a time, as long as the new rep email addresses are already updated in SFDC and Marketo, you can simply select all and do a "Change Owner...". But like Josh recommended, I'd definitely test on one record to start.