almost yes. BUT cannot perfectly called as cloned database.
1. RMAN has some beautiful implimentations to do cloning.
   backup the source db ( regular backups)
   identify resources to hold the cloned db.
   use rman to create the cloned db (all the files,
      including controlfile,logfiles,datafiles,
      and logical tablespaces , users, tables
      etc are auotmatically re-created by the RMAN).
2. else you
   can do create a cloned database using cold backups.
   please refer our other [url=http://www.orafaq.net/msgboard/serverutil/messages/7131.htm]postings [/url]regarding  this