As far as I know, different fedimint coins would be incompatible. They would show up as different coins in a wallet. Because of this, the system tends to centralize into one, the most popular, fedimint. This makes the whole idea much more risky than having multiple competing fedimints.
Also, I'm not completely sold on the idea. To me it seems that there is a danger of false sense of security. Federating a mint to 20 bad guys doesn't make it safe, while it might seem so.
No they are interoperable via the lightning network which removes centralization pressure. The 'Token' is just Sats and you can send Sats from one federation to another with normal lightning invoices. This is part of the innovation behind fedimint
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Cool, this makes it way better.
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