How to change dbid in oracle to specific value?
You would be better off using the nid command to change the dbid to a new value. then register your database with the rman catalog, if you use one.

nid help=y

DBNEWID: Release 12.1.0.2.0 - Production on Wed Oct 7 13:56:42 2015

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Keyword     Description                    (Default)
----------------------------------------------------
TARGET      Username/Password              (NONE)
DBNAME      New database name              (NONE)
LOGFILE     Output Log                     (NONE)
REVERT      Revert failed change           NO
SETNAME     Set a new database name only   NO
APPEND      Append to output log           NO
HELP        Displays these messages        NO