It’s only the built in planes that are streamed. 2024 also has a community folder so it’s just a case of copying a 2020 addon from one community folder to the other or if you want to get fancy using links from a central location to each community folder. There is no guarantee the aircraft will work but this is how you would go about testing one. The ones I’ve so far tested have ranged from will not even load, loads but has issues that make it un-flyable and one’s that work almost the same as they do in 2020.
Hope this helps get it going.