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.

225-241

 option 1      169- 197

                    13² -  14² + 1

 option 2      121 - 145

                    11² -  12² + 1

 option 3       289 - 325

                     17² -  18² + 1

 option 4      225 - 241

                    15² -  16² + 1(257 ≠ 241)