You have made inventory versions usable for official LEGO sets. As far as I know, this feature is not usable for MOC designers. MOCs only have 1 (the newest) inventory to select. It would be very helpful for us MOC designers to have this feature, if we have updates to our MOCs with bugfixes or new features. Users who have already built a previous version of this MOC, could easily check with rebrickable's compare set feature, what additional parts they need to upgrade their build to the new version of our MOC.