I don't know how the Goodreads plugin works, but assuming it works off the standard Tags column, then you won't be able to use the same library for both profiles. The Tags column is stored in the library, and it's only a single field. There's no way to put different groups of values in the same field and keep them separated.
The only way to accomplish what you want is to maintain two separate libraries.
The good news is that it's fairly straightforward to set up and switch between two libraries. The bad news is that you'll have to maintain two copies of each shared book.
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