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Can magento move existing reviews to a newly created product?
This can be done by manipulating the review tables in the database. In 22.214.171.124 the reviews are stored in six tables, of which two have to be modified: review and review_entity_summary.
In both tables replace the rows where the field entity_pk_value has the old product id with the right id of the new product (this value can be found in the table catalog_product_entity).