Creations, when you run a difference check in an image editor any pixels that are the same will be rendered black. Only different pixels show up. The reason you see a primarily black image is that the two scenes are nearly identical. Obviously there are differences where you wrote the version numbers in, and what you see (scramble) is the result of those differences. Obviously I only compared the left hand side of your renders, since most of the other side is covered by the render report.