Mastodon: @izax@pawb.fun
Even though Lemmy and Kbin use two completely different software platforms, they are both based on a technology called ActivityPub. This allows different servers (instances) to talk to each other using a process known as Federation.
At the moment, Kbin is federating (meaning talking to other servers, including Lemmy), so you can view and interact with Kbin magazines from Lemmy. I am not sure how it works on Kbin, but for us Lemmy users, we copy paste the Kbin link into our search bar.
So no, you don’t really need to make separate accounts unless the instance (website) has blocked yours or vice versa.
Fish flavored fries? Yuck! No thanks!