For any CI when you select any date in versioning tab to see the change logs, The “Version number” is same irrespective of which date we select.
Release : 17.3
Component : SDM - Configuration Management (CMDB/Visualizer/Grloader)
The version number tells us how many times the CI has been updated, for example in the above screenshot it's 6 which means, the CI had been updated 6 times.
In order to know the changes that have been made, clicking on the Versioning tab, gives you all the information.