So apparently Peertube works well, in part because the structure of the two platforms map onto each other well. Communities -> Posts -> Comments = Channels -> Videos -> Comments.
I experimented once, and from memory you can definitely subscribe to a peertube channel here. But I don't know my way around peertube so I don't know how well it works.
In theory, it should work with all of them, but in practice it's messy and clunky as all of them use ActivityPub in subtly different ways, with their own extensions and quirks.
Also Lemmy versions pre 0.18 (i want to say, unsure) won't work with GoToSocial or Mastodon instances with secure mode enabled. The recent versions should though.
Completely unrelated but I'm surprised how well Firefox Nightly's built-in translations worked here. Despite being made just by a few universities, working completely offline, and not having any AI bullshit or Google's infinite money and experience it was still comprehensible enough to understand.
I've noticed that Lemmy has a hard time federating to non-Lemmy instances. Looking up a user/community on Calckey/Mastodon shows a lot of posts and random things missing.
In theory yes Lemmy should federate with them all of course to be sure if it works on a per instance level you could always try it, As not all mastodon instances seem to work with Lemmy for some reason