Full screen mode: How to switch between opened windows of the same app using a shortcut?

I have read the answers here but couldn't find a way to do that.

I know we can switch between the fullscreen windows of the same app by right-clicking the app icon in doc and selecting the window you want to switch at as explained here. But this is not fast-way.

The best thing to have here is when I press Cmd + ` it should also switch full-screen windows as it does for the windows in the same space.