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.

37 : 266 53 : 378 45 : 322 43 : 318

43 : 318

The logic followed here is: (Ist number × 7) + 7  = Second number 37 : 266 = (37 × 7) + 7  = 266 53 : 378 = (53 × 7) + 7  = 378 45 : 322 = (45 × 7) + 7  = 322 43 : 318 = (43 × 7) + 7  = 308 ≠ 318