You should consider grouping the listings by assigned regions. If you a lot of locations, more than a hundred, trying to compare listing to listing would be very granular. W/o knowing much about what you are trying to accomplish, I think a starting place for you is to download the GMB Insights and then segment your locations by region. Then you can compare and contrast if you're needing that type of information. Otherwise, I prefer just reporting on the listings as a whole, unless there is a client need to segment.