To be eligible for the course of KCET, one need to score at least 45% marks in Physics and chemistry  along with Chemistry/Biology/Biotechnology/Computer/Electronics as additional subjects.

So the score of CBSE will be considered for the eligibility and the criteria is the same irrespective of the board.

For more information regarding KCET 2022 consider the link below:

https://news.careers360.com/kcet-eligibility-2022-released-minimum-qualification-marks-percentage-age-kea-kar-nic-in-news

I hope this helps. Goodnight!