Your best option is to create a support case with Genesys Care so that they can ensure stats are not linked for the old and new user. From what I know, if you were to delete certain data for GDPR purposes for example, Genesys may delete or anonymise the data without giving your the option via APIs. So Genesys Care engineers may have the tools to fulfill your requirements and clarify any side effects.
------------------------------
Hichem Agrebi
------------------------------