In my short time on Kbin vs. Lemmy, the communities seem quite different already. Kbin reminds me of Reddit today: lots of one line answers and sarcasm, some rude comments too. Lemmy (and Beehaw) so far seem more genuine with more thorough discussions and feels like Reddit did 10 years ago.
As far as I’ve understood, it should be possible, but right now Kbin has cloudflare’s DDOS protection and their configuration is disabling the federation to other instances. It’s apparently something they are working to fix so hopefully we get connected back up soon.