There's also the difference in the type of ingredients. My particular pound-sized piece of pork is substantially different than your particular pound-sized pie

There's also the difference in the type of ingredients. My particular pound-sized piece of pork is substantially different than your particular pound-sized piece of pork, and my tomato is not the same as your tomato, so achieving the same result from will require different cooking time, different added moisture, and depending on the differences it might even be impossible at all to get the same result. However, my 100g of sugar is the same as your 100g of sugar, and we can ensure that my 100g of flour is the same as your 100g of flour if we explicitly try control for things like gluten, which bakers definitely do.