A set of documents includes as follows:

  Invoice appears:       60 packages of goods

  Certificate of Origin appears: 60 boxes of goods

  In accordance with UCP 500 Article 13a, as the word "packages" is different from "boxes", they are the discrepant documents.

  But in accordance with UCP 600 Article 14d:

  "Data in a document......need not be identical to, but must not conflict with, data in that document, any other stipulated document or the credit."

  As "packages" is a general packing term, "box" is a concrete packing unit, these two words are not ______, so that invoice and certificate of origin are ______.