Your question is incomplete.
What database to what database?
Does the destination contain the same fields with the same name as the source?
A more complete description of the source and destination database would help.
OS and version? FMP version?
FMP version 9 DB to FMP v9 DB.
Source and destination do have the same field names.
Then making a blank layout in the destination database
In Layout Mode in the Source database, select all, copy
and paste into the blank layout in the destination database.