Can I use Thunderbird on windows laptop and K9 on Android for the same email account?

I am a long time Thunderbird user in windows. I want to be able to use the same email addresses on my android (Pixel 7 pro). If I understand it, syncing is not yet implemented. So if I do it what will happen? Will it mess up my email on Windows?

As long as you are using IMAP to access the mail in both locations, you will be fine.