If there's the same conversation shown on different kinds of Fediverse server, each server type will display it in its own format.
For example:
In the attached images, you can see a conversation thread in the replies to a PeerTube video post. On Mastodon it will look like a Masto thread, but on PeerTube it will look like comments below the video.
They are both the same thread! It's just displayed differently depending on which kind of server you're looking at it from.
p.s. To comment on a PeerTube video from Mastodon, just reply to that video's post. It will be shown as a comment in PeerTube.
To like a PeerTube video from Mastodon, just favourite its video post within Mastodon. It will be shown as a thumbs up on PeerTube.
To subscribe to a PeerTube video channel, just follow its account in Mastodon.
They are the same things being displayed differently depending on where you're looking at them from.
p.p.s. If you want to show a PeerTube video's post within Mastodon, just paste the video's web address into the search box on Mastodon.
You can also discover interesting PeerTube videos being shared over on @FediVideo
@feditips Something of a side note, how large is the content community of PeerTube as of now? That's the only reason I stick to Youtube.
It's still quite niche-based, but growing all the time.
I have an account at @FediVideo which shares interesting PeerTube videos, and a PeerTube server at https://fedi.video which federates with interesting accounts.