Yes, it stays the same.
An offset is maintained for each partition separately, so your new partition's offset will start from 0 and won't affect other offsets.
For each topic, the Kafka cluster maintains a partitioned log that looks like this:
![image](https://lh6.googleusercontent.com/cbpGfOzeRyEonX-uKBr63YbHiRNGNkOqM7qyNf-06o8wFEqVtDl1dUSKjX5n8SPmyS82a4q_0vfYmKlbR-Ze_lXV3YfZgYAfFaZQ6e3K0zJD0NQ2wjJWrJqSMNWPP86s7AiqIezz)
Hope this works for you!
Get your Kafka certification today to become certified professional
Thank You