Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different from the rest.

35 : 1221 21 : 437 11 : 118 33 : 1085

11 : 118

The logic followed here Is : Ist number 2  - 4 = second number 35 : 1221 = 352 - 4 = 1221 21 : 437  = 212 - 4 = 437 11 : 118 = 112 - 4 = 117 ≠ 118 33 : 1085 = 332 - 4 = 1085