Yes, you can.

This is one of the great things about the Amazon KDP system. You can tweak and re-publish to your heart’s content. Whatever is your creation is yours to change. You can continue to add to it, improve and change it indefinitely without impacting your ownership of the work.

However, as a practical matter, if readers are buying one version, you risk frustrating them if a week later, there’s a new, improved version available, right? Adding and improving your written creative works is more the province of blogging or article writing rather than fixing what you’ve done in a book.

Plan ahead and take care when publishing so that you aren’t compelled to keep issuing “updates,” to the consternation of your readers.