Content strategy focuses on content-related processes, while UX writing shapes user experiences through text. The two disciplines work in harmony.
Though often conflated in job descriptions and on UX teams, content strategy and UX writing are not the same. You can think of these areas as complementary: they work together to improve the user experience. There’s a lot of work and focus that goes into content strategy and there’s a lot of work and focus that goes into UX writing.