Multiple communities across the Fediverse

I am not sure how to word this. I have noticed that some mods have multiple accounts across the fediverse that have the same name and those accounts are modding in the same community. Take for example c/wnc where I mode. If I went over to piefed and crated an account name profthadbach there and add that account as a mod to c/wnc. I am sure that is cool because I have seen it a bunch. Now my question is if I create a community over at piefed called c/wnc and I post some article there do they show up in the lemmy.world c/wnc community and vice versa?