You should use an advanced filter by comparing this user’s role levels count to the (custom state) selected role levels count and get the ones that have the same count as selected role levels count. Comparing means intersecting. It should be something like this:
This User’s role_levels_candidate intersect with (Wherever the custom state is)'s selected_role_levels : count is selected_role_levels : count
Advanced filter and intersect are demonstrated in this post: Intersect two multi-item fields - #3 by hergin