Correct Answer: 49 – 96

Solution : Let's check the options –

First option: 47 – 74 (The number 74 is obtained by reversing the digits of the number 47)
Second option: 49 – 96 (The number 96 cannot be obtained by reversing the digits of the number 49)
Third option: 63 – 36 (The number 36 is obtained by reversing the digits of the number 63)
Fourth option: 97 – 79 (The number 79 is obtained by reversing the digits of the number 97)

So, the second option differs from the other three options. Hence, the second option is correct.