[Zope] Moving items from 2.6.1 to 2.5.1 ??

Hey folks, We've got a production machine running Zope 2.5.1 and one of our developers has a machine running Zope 2.6.1. Will we have any sort of problems moving (exporting then importing) folders, dtml-methods, dtml-documents, and python scripts from the newer version to the older version? Thanks, Ted