You seem to be confused what the word “instance” means in a fediverse context. The answer to your question, as asked, is “no, the question doesn’t even make sense”.

Lemmy and Mbin are two different backends that talk in the same language (“protocol”), ActivityPub, to each other. The entire idea of that common language is that you should be able to use either of them and also communicate with people using the other.

The Fediverse is called that because it is “federated”, meaning different instances (and different platforms too!) can communicate with each other. A Mastodon user can see Lemmy posts and interact with them, for instance, and in your case, you can see Lemmy posts as an Mbin user. Everything is interconnected rather than being confined in their own little box!

“Instances” are what we refer to the hosted servers. For example, sopuli.xyz, lemmy.ca, feddit.org, and programming.dev are all Lemmy instances, hosted by different people and groups around the world. These can all talk to one another, so even a tiny instance where the only user is you and a few friends can see the posts of everybody else, and vice versa! Just something to keep in mind, as Lemmy, Mbin, etc. are not one instance, they are collections of many!

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Welcome!

We have some guides / infographics for new users, which you might find helpful. These two pages in particular:

https://fedecan.ca/en/guide/get-started

https://fedecan.ca/en/guide/threadiverse/detailed-overview

An instance is the site where you make an account. If we extend the analogy to email, then gmail.com is one instance while hotmail.com is another instance. If you make an account on Gmail, you can’t use that login on Hotmail but you can still see content from people on Hotmail.

Lemmy, Piefed, Mbin, Mastodon, Pixelfed, etc. are all software. It’s hard to extend this analogy out, but imagine if Google released the code for Gmail freely so that anyone could easily set up an email website that had the same appearance and functionality as Gmail. That is what is happening here.

So in the same way, lemmy.ca, lemmy.world, sh.itjust.works and many other Fediverse instances are running the “Lemmy” software and that’s why they look and feel very similar. Where they differ comes down to the people running a particular instance, since they will have different rules for what you can do. You can find that information in the sidebar.

Now all of the Fediverse platforms use a common and agreed upon language to talk to each other. Because Lemmy, Piefed, and Mbin software all use this language and follow a similar format, you can easily share content between all of them. That is what the second guide page talks about. They all have communities, posts, and comments, and work in a similar way.

Usually people make one account on a forum/threaded instance (Lemmy, Piefed, Mbin), and one account on a microblogging instance (Mastodon). This is because the format of microblogging (ex. Twitter) is pretty different from that of forums (ex. Reddit), although it is technically possible to cross post in between them.