if i delete a post from my mag that is from a user from lemmy, will it be removed on both ends (both kbin and lemmy)?

hallucination@kbin.social to /kbin meta@kbin.social – 3 points –

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It depends on what the remote server does with the federated delete command. You should generally assume that anything you post to the fediverse is permanent.

This is only from what I have seen and I have no knowledge of how federation works:

No. Ex: there have been many spam posts on food@kbin.social that I made a post about. I found out from that post that they were removed from the kbin mod, but I could still see them here on Midwest.social.

See this post for more info. There is also a link in there about this known issue.