Check if walls are placed on top of each other

Revit
,
1

I am trying to find a way how to check if two walls are placed on each other and, eventually, filter out top ones.

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So far I have no clue in which direction to look. Idea I had is to extract top and bottom surfaces of each wall and see if they have same location (maybe by curves?). The issue with this workflow I can imagine is situations, when geometry of walls is different, e.g. surfaces will not be totally laying on each other (see snapshot for illustration).

Any suggestions where I should look? Thanks!

2

I am searching for the same. I am going with Bounding Box method lets see