The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number pairs except one. Find that odd number pair.

4328 : 8324

The logic followed here Is :

ist number : reverse of ist number

4328 : 8234 but  8324 is given (odd)

2437 : 7342

3569 : 9653

1786 : 6871