Equivalent of Material Parameter Collection for 3d widget?

Hello, I was wondering if there is something like a Material Parameter Collection, but for 3d widgets; say that I have several 3d widgets on my screen, and I want to change the color of all of them at once; can I do that, or do I have to [reference and change all of them one at a time][2]?

You can use Blueprint Interfaces to do this, I believe.

Get all actors that implement your interface, then use a ForEach loop and use interface calls or possibly castings to set the color parameter.