How to find out which objects share the same color? I have created a scene with a lot of objects and I'd like to clean up the project. My question is: how can I find out which objects share the same color? 



There are 2 objects that share the same color, 1 object is the cube but where is the second Object?
You can use the outliner to filter the scene collection by name.

So you can use it in order to search using the material name.

Once done select all the filtered objects using A in the outliner.