Carol, sorry, didn't answer your question. No difference between BB or PR....just adjust the cooking time. BB are smaller so less time...PR are larger so more time is necessary. Just put them in and forgettabout them.....check them periodically and enjoy when done. Not to worry about food preparation.....it's not brain surgery!! Check them & if you don't like them, add something else that hits your 'fancy' ie: juice/jam/sugar/salt etc.!! Good Luck!!