I see little difference beyond the ability to microblog on Kbin. I think it was unnecessary to rename communities, and causes confusion. I still keep an eye on my kbin.social and fedia.io logins, but I just can’t access content I can find from multiple lemmy instances. I was also swayed away from Kbin by an admin who was running it but ultimately gave up on it and switched to lemmy because Kbin is unstable. (I’ll update this comment with a link if I can find it)