Using VSS designer:

 

Choose a prop to be your control prop - the source of the rules for applying shaders. I use a ball - but it can be anything.

Using VSS, Designer buttons, add a material zone called Apply Rules.

In Apply Rules add a Rule node with the name *. Now this control prop applies to all objects in the scene.

Add a material zone called Shader Rules to the control prop.

Add a material zone called Concrete.

In Shader Rules material, add a Rule for the name concrete. Add a Copy node for Concrete. Connect the Rule Concrete to the Copy Concrete. This says that for all target materials called concrete, you wish to copy the shader in the control prop's Concrete material.

Now edit the control prop Concrete, and hit the VSS button Synchronize. It should apply your shader to all concrete materials of all props.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)