of course! every person has to make his own shake based on his personal requirements. so if you need 320 calories and 33g of protein per meal make a shake with 320 cals and 33g of protein. so yea, it will make a huge difference but in a positive way
you dont necessarily NEED to have the recommended amounts, scooby's numbers are recommendations only but do what you think works best for you. everyone has his very own requirements/preferences. try out different ways and see how you feel.
for the last question, there is no order, only that fat is the last thing you wanna have! but protein, calories and carbs are all equally necessary and your meals have to be well balanced.