My friends, Jan and Susan are both students from different schools.
Jan is studying Biology and Susan is studying Life Science.
Jan have been doing some research on Elephants for some months.
Susan had finished some lessons about Herbivore (e.g. elephants).
Now that Jan and Susan both know something about Elephants,
can I say that Jan and Susan have duplicate knowledgae of elephants?
Sorry that I don’t know other vocabularies to replace the word “duplicate” in my question,
please suggest me some other vocabularies, teachers.