Agree. While FS2020 aircraft may work in FS2024, I am sure the reverse is not true. I would bet good money that Carenado's contract with M$ stated the 408 had to be FS2024 native. Actually I was surprised how many new Carenado aircraft are included in FS2024.I'd assume the answer is no, since the 408 was done under contract to Asobo/Microsoft, so it's probably exclusive to FS2024.
Plus, it's becoming increasingly clear that the "MSFS airplanes will work just fine in FS2024" statements were, shall we say, a bit too optimistic, so wouldn't be at all surprised if converting it to work in MSFS required way more work than it's worth.