I consider them different animals because with one you have a pressure gauge and the other one you don't. Say to can green beans, you can can them at 10 pounds pressure for 50 minutes or at 15 pounds pressure for 40 minutes. I AM MAKING UP THESE NUMBERS. With a pressure cooker you have no idea as to the amount of pressure inside the cooker and therefore no idea how long to can any food stuffs.
Today I pressure cooked some dried, soaked pinto beans for one hour and 40 minutes. I have no idea the pressure they were cooking at. It doesn't matter. All that matters is that the beans were done to DH's liking