Thank you!
I can confirm that the boundary sphere as drawn by the debug LOD menu looks exactly the same in FS2024 and FS2020.
The LOD screensize calculation or scaling seems to still be different with the same “Object level of detail” setting (checked 100 and 200). This leads to different LOD switching points, mostly visible at minsize larger than 100.
Screenshot from exactly same position showing exact same boundary sphere, but 2024 says Size:158, while 2020 says Size:1000.
Moved camera until both sims show same Size:100
Moved camera until both sims show Size:915
In case it matters for testing: This is ENSH by Wombii in the marketplace