Failing to write the version code in your KCET OMR sheet can be a concern, but there might still be a chance your answer sheet gets evaluated.  While it's important to address this, try to stay calm. Many students might forget to fill out certain details in the OMR sheet.

KEA might consider evaluating your answer sheet if all other details are filled correctly (especially your roll number).

https://engineering.careers360.com/download/ebooks/know-all-about-karnataka-cet-kcet

I hope it helps!