Is it possible to merge user accounts?

Hi. We have contractors who are converted to employees from time to time. Once their new employee account is set up in the HR system and the data syncs with the community platform, they end up with two accounts. The old one is disabled and the new one becomes the active account. However, all their previous posts are still with the old account. Is there a process to merge these accounts or sync the post activity from the old account to the new account? Thanks.