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Hi Eva,
I asked the same question of Jeff Scialabba, who informed me today that the Norton Critical Edition “contains essays in addition to the novel that will be assigned reading. Those readings are only available in this edition of the book, which is why it is required for Dr. Milgram’s course.” (You can see what those essays are by previewing the book’s Kindle version on Amazon.)
Additionally, the two Oxford editions I’ve seen have different translators (Coulson and Slater) from the Norton edition (Katz), though I can’t speak to how significant that difference is for Dr. Milgram.
Best,
Francis
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Edit: In an unlikely though pleasant coincidence, during the fifteen minutes that I wrote and submitted this comment, Dr. Milgram has posted her own response, which makes the above redundant.