First numbers that belong to both sets:
10,
12,
21,
23,
43,
101,
121,
123,
210,
212,
321,
323,
343,
1010,
1012,
1210,
1212,
2101,
2121,
2123,
2321,
2323,
2343,
3210,
3212,
4321,
4323,
4343,
10101,
10121,
10123,
12101,
12121,
12123,
12321,
12323,
12343,
21010,
21012,
21210,
21212,
23210,
23212,
43210,
43212,
101010,
101012,
101210,
101212,
121010,
121012,
121210,
121212,
123210,
123212,
210101,
210121,
210123,
212101,
212121,
212123,
212321,
212323,
212343,
321010,
321012,
321210,
321212,
323210,
323212,
343210,
343212.