Does it mean MAID allow same username with different password?

Since when we create an account. we verify whether there is a value under key H(Username+Salt). And this salt is came from both username and password.

I think you can have the same login as someone else as long as the pin is different. But this is not a login name that is showed to others on the network. Registration of a unique name of something like a profilename happends on a diferent layer as far as I know.

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What if I wanna change my password or PIN someday? According to the paper self-authentication, this will lead to create a new account in SAFE. Then what about my data? Move to the new account automatically?