I have not needed to do that in ages but take a look at this video: https://youtu.be/Q2-NlFJrAL8?feature=shared. This video explains how to update SharePoint system fields Created, Created By, Modified, Modified By using the SharePoint REST API.
I would instead add fields to the list where you are copying the data and populate it with the existing data. In other words, Originally Created, Originally Modified, etc. This way. the data of who copied the item and when will be available.
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