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Yes. it is the right procedure.
./runInstaller -silent -detachHome ORACLE_HOME="<OracleHome-Directory>" ORACLE_HOME_NAME="<OracleHome-Name>"
Have a look at
R12.2 : How To Create, Update or Rebuild The Central Inventory For Oracle Applications E-Business Suite ? (Doc ID 1588609.1)
If you are doing the cloning using adcfgclone then the new home will be registered automatically and there will be no duplicates.
What are the installation paths for both instances?
The path is the same since I just perform recloning of CRP using same home base /u01/appcrp/CRP