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Do a point in time recovery of Database A. Then just change the DBID number. ( DBNEWID utility )
Restrictions and Usage Notes for the SET DBID Command
You should only run the SET DBID command in the following specialized circumstances:
You are not connected to a recovery catalog and want to restore the control file or server parameter file.
You are connected to a recovery catalog and want to restore the control file, but the database name is not unique in the recovery catalog.
The server parameter file is lost and you want to restore it.
You would SET DBID before the RESTORE CONTROLFILE
Hemant K Chitale