The heads have the same bolt pattern.
On the Common Rails, there's a spacer or "rocker box" that adapts the upper valve cover to the head.
The problem with using the 24 valve rocker cover is that there is no place for the wiring to go for the injectors, which means you need to cut holes on the 2003-2005 CRs, or make a valve cover gasket to work on the 2006-up.
Mark.