Those are super easy to change, so no one would know that it’s you across different addresses unless you specifically tell them.

Or they recognize your writing (granted, unless you admit to it or do things like tell the same story on both accounts, it is basically just a hunch rather than solid evidence). I’ve accidentally done that with someone across websites once based on primarily based on how they wrote (granted it was a very niche community, making that cross-website different-username identification based on solely writing style much more feasible). If you write generically and avoid things like unusual emoticons (or intentionally write differently with different handles), its a lot harder to do that.