The length of copyright is different. I want to say that it's 70 years for a pseudonymous work but it's lifetime plus 70 years if you register under your own name.
I use a version of my own name in the copyright notice section of a book but have only actually registered copyright on one series since copyright applies as soon as a book is published even if you don't register. It's just the amount of damages you can get that differs IIRC.
In the application, it asks for legal name & pseudonym. I use a hyphenated version of my name as a pen name, it's not exactly the same as my legal name, so I listed this as the "pseudonym" - although it's not really. I didn't see any note about length of copyright.
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