The newly released Switch version of KOTOR 2 will get its Sith Lords Restored DLC this year.
The free content update adds bonus content not seen in the original release, adding a mission with HJ-47, with new dialogue, as well as an additional ending.
However, you should know that base save files will not work with Restored Sith Lords content, though ‘you can access any previous save files by disabling the DLC content in the in-game main menu.’
You will still be able to access these save files with the DLC installed and if you ‘still wish to finish your non-DLC playthrough, you can access those base game save files by disabling the DLC in the game main menu’.
Sith Lords Restored DLC will launch Q3 2022 for Star Wars Knights of the Old Republic II: The Sith Lords on Switch.