1.
corresponding in pattern, color, or design; complementary.
"a blue jacket and matching skirt"
**2.
equal in number or amount; equivalent.
"the college will provide matching funds to complete the project"**
I'm aware, but the second definition I think is also valid, and perhaps one that many people are more colloquially familiar with. After all, a match (singular) is a 1:1.
Search Results match·ing ˈmaCHiNG/ adjective adjective: matching