Comes to matches featuring very similar opponents (6)
I believe the answer is:
equals
'comes to' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for equals that I've seen before include "Peers, matches" , "Is identical in quantity, value" , "They're at the same level" , "Corresponds to" , "Persons of the same rank, for instance" .)