Follow below steps:
1. Create a sheet containing map to show necessary details.
2. Create another sheet to show all the details for all countries.
3. Add country as a filter to both the sheets.
4. Create a dashboard containing 2 sheets.
5. Add action from the first sheet to 2nd sheet as a filter to show only those values.
6. Now press ctrl + click on the map to show and compare those country values.
Hope this helps you.