I have found that like most cats and kittens if they are introduced properly there is little trouble. Especailly where a kitten is concerned. So I would put a kitten with a New Found Cat together. As long as the New Found Cat has been tested and has a clean bill of health from the vet. The kitten will quickly learn who is top cat. I have placed kittens with Chesapeake Bay Retrievers (sp) and other large dogs. Unless the New Found Cat needed to be an only cat because of a behavior problem it would work out.
Well have to go and check on them will take pictures and post them tonight or tomorrow.

Stella