Matching "match" when written in more than once will categorize it as a separate category.

When creating a Matching question for a quiz, I created a "choice" as "blue" and a "Match" as "color." When I created another pairing, "green" as the "choice" and wrote in "color" as the "Match" it did not automatically combine the two matches and treated each "color" as a separate category.

http://snag.gy/9QTKT.jpg