yeah, I think that's what he's asking. The big difference is manual work (CCE) vs. automation (DVD-RB/CCE). Rebuilder will feed the needed info in a project file to CCE for each segment to be encoded. The only time you would use CCE is if you want to test a segment individually rather than doing a full encode, or you have some files (avi, avs, etc.) you want to encode.
Check on the list of file types that CCE accept.