@DarkTides yeah! they both work with activitypub!

I don't follow any groups/magazines/whatever directly from mastodon (because they'd clog my feed).

However, you can copy the post or comment links, paste them into the search bar in mastodon, and then boost/favourite/reply :)

It's a little bit awkward, but you get used to it.

Favourite in mastodon turns into an upvote on the lemmy/kbin side. Boost doesn't really do much on lemmy/kbin (yet) but does increase reach on the mastodon side as it always does.

And replies, naturally, show up as you'd expect :)