They have the same number of vertices and edges. The degree sequences are the same (5,4,4,4,4,4,3). Looking at each vertex of degree i, they have edges to vertices of the same degrees in each graph. I've tried looking for cycles which are not repeated, but there is not a realistic way to do this systematically.
Note that this is from a practice midterm for an introductory combinatorics course, so it should be doable by hand.