There are questions on Data migrating (specific data - Domain Separated) from one instance to another instance.

1. Is there any process or tool which can move the Domain Separated data

- Sorry to say that there is no such process/tool to move a few clients(Domains) from one instance to another.

2. Can we move the complete data of one instance to another instance without changing the data on the target instance?

- This can be achieved by Clone, Where clone will copy the data of Source instance and at the same time preserves the target instance data when added in preservers.
- Support will not have scope for the identification of the tables as they cannot determine how many tables are affected as a whole.