Yes it is different, and the difference between gov edition and ltsc is that. The gov edition isn't designed for long term support without change, but to increase security of windows and remove all the telemry and forced integrated services from Microsoft.

This info is publicly available so more detailed info should be easy to find.

All the sources I can find say that Enterprise G is China-only. The US Government (among others) doesn’t use it, even for classified stuff.

Telemetry is a bit of a non-issue for many national security applications-they run on special air-gapped networks with zero direct access to the public Internet, Windows can try to phone home to Microsoft all day long, it’ll never get through.