It's related to the case of the word. In 1 form comparison is "сопоставлениЕ" without M. It's very coomon, for example, the same situation is with "удивление" (astonishment).
"Это вызвало у меня удивление" (it surprises me) , but "я с удивлением услышал эту новость" (I was surprised to hear this news).