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.

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