Under the hood, the code for Knights of the Old Republic and Knights of the Old Republic II was fundamentally restructured to build off a common base, so a lot of the underlying concepts in the first game are also available in the second, but are not as visible.
You can see it in action in this video here: In xoreos proper, the most visible change is in Knights of the Old Republic: seedhartha has put a lot of work into making the tutorial partially playable! The player character can collect their belongings, put on their gear, let Trask open the first door, open the second door and engage in mock combat.
As a belated 10th birthday (yes, xoreos is 10 years old now), here’s a new release of xoreos! It’s xoreos 0.0.6, nicknamed “Elanee”, including xoreos, xoreos-tools and Phaethon.