I've heard that if you have TSW2020 DLC you can get them for free in TSW 2 but if you buy TSW 2 DLC can you get them for free in TSW2020? Thanks in advance and sorry if this has been asked before.
Well yes if you own the 2020 versions of the DLC but if you get the TSW2 versions of the DLC you can only get it in TSW2.
If you buy the DLC for TSW2020 you can use these in both games. If you buy the DLC for TSW2 you can only use it in TSW2.
If you got it on steam, you can try to explain this to Steam support. Most of the time they will let you change it. In any case, you do not lose anything by trying.