Not from what I've seen, unfortunately. Getting new instances to federate, at least from smaller, non Lemmy instances, is a bit of a pain. In the past I've done some testing with the two mags I currently own, and it looks like things don't always properly federate.
I've also noticed the same goes for voting. There's been more than once I've seen differing upvotes/downvotes on a thread depending on whether you're looking at it from kbin vs mbin.
testing