Version is different ? soure VS download

Version up to current time(2022-05-30)

1.Git soure is:
set(Slicer_REVISION “30876”)

2.Download url(https://download.slicer.org/) version is 30976

3.When make:

[...]
Configuring Slicer requires admin account [OFF]
Configuring Slicer install root [$LOCALAPPDATA/NA-MIC]
Configuring Slicer release type [Experimental]
Configuring Slicer version [5.1.0-2022-05-29]
Configuring Slicer revision [30876]
Configuring VTK
Slicer_VTK_RENDERING_BACKEND is OpenGL2
Slicer_VTK_SMP_IMPLEMENTATION_TYPE is TBB
Slicer_VTK_VERSION_MAJOR is 9
Configuring Slicer with Qt 5.15.2 (using modules: Core, Widgets, Network, OpenGL, PrintSupport, UiTools, Xml, XmlPatterns, Svg, Sql, Multimedia, MultimediaWidgets, WebEngine, WebEngineWidgets, WebChannel, Script, LinguistTools, Test, )
[...]

Following Slicer@813b9215f of 2022-04-30, we allocated 100 commits for the maintenance of the 5.0 release.

This explains the difference of the computed revision before and after this commit.