I have observed a similar situation with managed virtual servers using cpanel. Typically only the main root account has ssh/sftp access.. ftp accounts are limited to ftp access.
Though I suppose this could also depend on how the server is configured, i know that proftpd can be compiled/configured with sftp support via mod_sftp so I imagine if the server was running proftpd with mod_sftp then maybe (just maybe) ftp accounts would be capable of accessing sftp too.
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