Back up your database first, then run this query in phpMyAdmin (or if you don’t have phpMyAdmin, run the query out of functions.php on an admin hook using $wpdb->query):
UPDATE wp_postmeta SET meta_key = '_logo' WHERE meta_key = '_thumbnail_id'
This will preserve all of the current IDs and just change the name of the meta key. No need to duplicate information or change them one by one.
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