Search result -> filename instead of name (For smart folders)
I don't think you can customize Finder in that way.

There is a third party program that does just what you want: HoudahSpot.
This lets you add columns for any attributes known to Spotlight. There are hundreds to choose from.

Filename is one of the columns you can add. By default, HoudahSpot and many other applications on OS X show the "display name". This can be a localized version of the file name or something entirely different. E.g. Apple Mail stores messages in numbered .emlx files. It stores the message subject with Spotlight.

Full disclosure: I am the developer of HoudahSpot.