ConsideringOfficial response from Alex Simoes-McArtor
We do offer the ability to export and import database data from one nation into another. I would recommend following these guides here:
Keep in mind that these profiles won't include any activities (since the two nations are different).
As for website information, we do allow website and theme sharing for the Network Plan (intended to share websites from the parent nation to smaller subnations).
Depending on what you are looking to accomplish, you could also change your slug from one slug to another.
Feel free to reach out to us at firstname.lastname@example.org and we would be happy to help you with any further questions.
Complete and current information on how to use NationBuilder is available in the documentation section.