Is there a possibility that I can extract the Novus Universum files from SOAGE?
You can get pretty much all of the needed files from SOGE; with the exception of the gameplay.constants and galaxyscenariodef files. For those, you'd have to overwrite what isn't necessary, plus take out what's needed and paste it into/over a vanilla Sins galaxyscenariodef file, respectfully, in order to make it work. If you have some experience with modding Sins; it shouldn't take that much time to do.
If you can download both the Novus Universum posted in the OP, you will be able to see what files you will need for a Rebellion version, and then you can grab those files directly from SoGE, with the aforementioned exception of the gameplay.constants and galaxyscenariodef files.