Remove duplicated objects than are exactly the same?

Hi everyone :)!

In my current project I’m doing some import of objects from dxf and some of them are almost absolutely identical. I would like to remove the double objects. Problem is that’s not a built-in function in Blender form what I found.

There is something like 400 - 500 objects so I would prefer not something graphical…

I could use merge object, then remove double, but I don’t want all objects to be the same!

Any idea?