No, Khemia 2 is a version that's been around since 2020 and probably just fixed some minor bugs/typos. They're gonna remake it soon, which will imply a rewrite. If you aren't looking to invest in a short story that'll be decanonized in (hopefully) a very near future, then you should wait for the update; but if you're really yearning for some more Adastra content, you could read this Khemia version as a curiosity, since this will be a discarded version in the future, and playing that sort of stuff when it comes to videogames or even media in general is always pretty cool.