Vegetable dishes can generally cook at any temperature by just adjusting the cooking time. I'd bump up the pork loin to 375 and cook the sweet potatos and cauliflour at the same temperature. If either has a topping that needs to brown, you may need to put it under the broiler for a couple of minutes before removing from the oven. You can tell when the vegetables are done by checking them for tenderness with a fork.
"I’m going to break one of the rules of the trade here. I’m going to tell you some of the secrets of improvisation. Just remember — it’s always a good idea to follow the directions exactly the first time you try a recipe. But from then on, you’re on your own." - James Beard