Would it be necessary to uninstall my current git and Github Desktop installation in order to to adjust my git command-line tools?
No both are completely independent.
- git for Windows delivers MSys2-based Git builds (see “How are msys, msys2, and msysgit related to each other?”)
- GitHub Desktop embeds a fixed (older) version of git-for-windows, in quite a complex path (
C:\Users\vonc\AppData\Local\GitHub\PortableGit_<sha1>), and you cannot change it easily: “How to update git version from GitHub Desktop on Windows”
You can safely install git-for-windows in addition of GitHub Desktop: both will ignore each others.