According to this HIGHLY incomplete list http://www.mongodb.org/about/contributors/error-codes/ they're both related to duplicate keys. But I was not able to get a 11001 error. All of the following threw a 11000 error:

  • inserting a document with an _id that already existed
  • inserting a document with duplicate fields where the fields had a compound unique index
  • updating a document with said compound unique index

So this goes completely against the linked page, which says 11000 is for _id and 11001 would occur on updates (not inserts).

So my question is: When does 11001 occur?

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