Four number-pairs are given out of which three are alike in a certain way and one is different. Select the number-pair that is different from the rest.

18 : 306

The logic followed here is:

Ist number² + ist number = second number

18 : 306 = 18² +18  = 342 ≠ 306(odd)

23 : 552 = 23² + 23  = 552

13 : 182 = 13² +13  = 182

25 : 650 = 25² + 25  = 650