Ripper does not include Cinavia Removal, but if you have Removal in Copy mode it should work in Ripper also, i.e. you do not have to buy Removal again to use it in Ripper as well as Copy.
In using Ripper for UHD or any other Source, if you are using the Video Passthrough setting the source content is just copied, never decoded or encoded, so the GPU is not used and the output and input files would be the same size, etc. Also, for UHD, only certain GPU versions support it (Intel Kaby Lake or later CPU for IQS or Nvidia GTX 1050 or higher).