So, on my PC, I have MSFS 2020 Standard & 2024 Premium DeLuxe. So when the carryover was implemented, my 2020 Standard was auto-upgraded to 2020 Premium DeLuxe with the 2020 aircraft & airports of that edition.
Note that you do not get the 2024-exclusive (New) aircraft such as the H225, Globemaster, Albatross, Beluga, etc. in your 2020 hangar.