Can I migrate reporting data from one Zendesk instance to another?
It's not possible to migrate reporting data from one Zendesk account to another. Explore reports on actions that happen on the different products of your Zendesk account. If that data isn't present on your account, there isn't a way to make Explore show reports from an instance.
For related information, see this article: How do I merge or migrate two Zendesk accounts?