Hello,
DSpace-CRIS and DSpace are separate systems. At this time they do not have a common roadmap or a common release numbering scheme.
DSpace-CRIS is based on DSpace but includes a number of additional/modified features that are necessary for CRIS systems.
DSpace's governance and development processes are entirely community/volunteer based with no single institution controlling the software. (4Science is also a contributing service provider for DSpace, but only one of many.)
Overall, the differences you are noting are because features are not identical between DSpace and DSpace-CRIS. In some situations, DSpace may get a feature before DSpace-CRIS. In other situations, DSpace-CRIS may get a feature before DSpace. So, it's important to make sure you are checking the correct documentation for any specific feature.
(NOTE: I'm not involved in DSpace-CRIS, so I don't know the answer to your specific problem. But, hopefully others on this list can provide you with advice or help on your DSpace-CRIS question. Or you can contact 4Science more directly if you need more immediate help.)
Tim