to avoid the hazzle of doing FTP and maitain compatibilities 
1. alwyas use a lower version of export / import agains
   a higher version.
2. establish a tns connection from your
   target dadtabase to your source database.
   your target database servers exp to do the export.
   dmp file is created somehwere local in the target machine.
   now use target database server's imp to do the import into target database.
3. ELSE do the ftp transfer as Anand mentioned