You can't, that's not how snapshots work.
When you create a database snapshot, any changes you make to the source database of that snapshot, the original version of the page is then copied into the snapshot. Hence all that the snapshot contains is the original version of pages that have changed in the source DB since the snapshot was created.
A revert to snapshot just copies those original pages back into the source database.
Hence if you create a snapshot on your testing DB, it's tied to the testing DB, containing nothing more than the pages which have changed in that test DB. It can't be used to revert any other database because it only knows the changes made to the testing DB.
Snapshots aren't backups.
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