New Bengal kitten..hoping to switch litter & food.?

You can most likely switch the cat littler to non pine without any issues. I would probably buy a small bag of the pine but don't open it initially. Get a cat litter that as a similar texture such as yesterdays news with pellets similar in shape to what the kitten is used to now. After you get the kitten, introduce it to the litter box by placing it in the box a few times. If the kitten does some digging around in the litter it will likely readily accept the litter option. If not, put just a little bit of the feline pine on the top to emphasize that it is the new litter box. As far as the food is concerned, it is best to mix the desired new food into the old food and transition the kitten over about 7-10 days to the new food. Since you know you are not interested in feeding the Royal Canin, you might ask the breeder if she could give you a couple of cups of Royal Canin to get you started. You can offer to pay for it but obviously pay less than a whole bag would cost you. When I gave away kittens last year I always provided a few cups of the food the kittens were on to get the folks started and to alow them to use it to transition off of if they wanted to feed a different food.