Update Account record with another GUID in CRM dynamics.

We have 4 crm dynamics instances (dev, test, stage, & Prod) and in each instance we have there is the same account (account X). But this account has a different guid for each instance. I want to take the guid from the PROD instance and update account X with the PROD GUID in the other three instances. I want to update instead of create a new record because I don't want to lose the relationships of the existing account.I keep running into issues, so is this doable and does anyone have any suggestions on how to do this? Each instance has a different database so that isn't the issue.

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