First numbers that belong to both sets:
12,
21,
32,
45,
56,
65,
76,
89,
101,
121,
212,
232,
321,
345,
432,
456,
545,
565,
656,
676,
765,
789,
876,
989,
1012,
1212,
1232,
2101,
2121,
2321,
2345,
3212,
3232,
3432,
3456,
4321,
4345,
4545,
4565,
5432,
5456,
5656,
5676,
6545,
6565,
6765,
6789,
7656,
7676,
7876,
8765,
8789,
8989,
9876,
10101,
10121,
12101,
12121,
12321,
12345,
21012,
21212,
21232,
23212,
23232,
23432,
23456,
32101,
32121,
32321,
32345,
34321,
34345,
34545,
34565,
43212,
43232,
43432,
43456,
45432,
45456,
45656,
45676,
54321,
54345,
54545,
54565,
56545,
56565,
56765,
56789,
65432,
65456,
65656,
65676,
67656,
67676,
67876,
76545,
76565,
76765,
76789,
78765,
78789,
78989,
87656,
87676,
87876,
89876,
98765,
98789,
98989,
101012,
101212,
101232,
121012,
121212,
121232,
123212,
123232,
123432,
123456,
210101,
210121,
212101,
212121,
212321,
212345,
232101,
232121,
232321,
232345,
234321,
234345,
234545,
234565,
321012,
321212,
321232,
323212,
323232,
323432,
323456,
343212,
343232,
343432,
343456,
345432,
345456,
345656,
345676,
432101,
432121,
432321,
432345,
434321,
434345,
434545,
434565,
454321,
454345,
454545,
454565,
456545,
456565,
456765,
456789,
543212,
543232,
543432,
543456,
545432,
545456,
545656,
545676,
565432,
565456,
565656,
565676,
567656,
567676,
567876,
654321,
654345,
654545,
654565,
656545,
656565,
656765,
656789,
676545,
676565,
676765,
676789,
678765,
678789,
678989,
765432,
765456,
765656,
765676,
767656,
767676,
767876,
787656,
787676,
787876,
789876,
876545,
876565,
876765,
876789,
878765,
878789,
878989,
898765,
898789,
898989,
987656,
987676,
987876,
989876,
1010101,
1010121,
1012101,
1012121,
1012321,
1012345,
1210101,
1210121,
1212101,
1212121,
1212321,
1212345,
1232101,
1232121,
1232321,
1232345,
1234321,
1234345,
1234545,
1234565,
2101012,
2101212,
2101232,
2121012,
2121212,
2121232,
2123212,
2123232,
2123432,
2123456,
2321012,
2321212,
2321232,
2323212,
2323232,
2323432,
2323456,
2343212,
2343232,
2343432,
2343456,
2345432,
2345456,
2345656,
2345676,
3210101,
3210121,
3212101,
3212121,
3212321,
3212345,
3232101,
3232121,
3232321,
3232345,
3234321,
3234345,
3234545.
Some larger examples :
987876545,
987876565,
987876765,
987876789,
987878765,
987878789,
987878989,
987898765,
987898789,
987898989,
989876545,
989876565,
989876765,
989876789,
989878765,
989878789,
989878989,
989898765,
989898789,
989898989.