Think of the universe as a painting. There’s the image made in paint, and the surface it was painted on. The canvas.
The stars, the planets, the gasses, the matter and energy and even the space between are the paint. What’s the canvas? Is there a canvas? Would the canvas follow the same rules as the paint?
The universe IS the canvas. Everything else that was added to it (stars, planets, supernovas, black holes, gases, etc) is the paint.
There might be a copy of this canvas, but we can’t know unless someone manages to prove that you can travel between universes. And even then, it’s likely just either our universe with very small but effective modifications, or it’s a segment of our imagination.