If I purchase the Carenado c172 from the 2020 Marketplace will it also show up in my 2024 aircraft inventory or do I also need to purchase it in 2024 as well?
Yes, but it’ll be the 2020 version and the Garmin 530/430 are not fully functional. You get the old, original units and not the Working Title upgraded ones for 2020.
The 2024 version is much improved. Get that one if you can. I’m not sure if that one carries back to 2020, but I doubt it since it’s a totally new plane.