adjusting the weekly menu

This is my first week in the program and I have a few questions re: weekly meal plan:
– even though my weekly meal plan has variety every day, would the plan still work if I pick one daily menu (e.g., my favorite breakfast, lunch, dinner and snacks) and use it all 7 days?
– is the weekly meal plan built with an optimal balance of food for EACH DAY or is it balanced for EACH WEEK? For example, I noticed that some of the snack options are only dairy – e.g., yogurt, milk, ice cream, so would can i switch it for a snack from another day – e.g., 6 crackers and 1oz string cheese, even though it is not listed as a replacement option?

Thank you!