One possibility is to use consolidation to compare the lists.
In Col A put all the numbers of List 1, in Col B put 1 for every item in List 1 (after the first two, just select both and double click when the cursor turns dark cross-hairs). Then paste the numbers of List 2 below in Col A, then in Col B put a 2 for every item in List 2.
Helps to name the ranges. Then us consolidate, in the finished view. Those with 1 in Col B appear only in List 1, if 2 in Col B, then only in List 2, and if 3 in Col B, then those appear in both lists. Filter and copy those.
HTH