I'm working with 4 artboards in .ai, 4 diecut shapes on each board need to line up with the others

I am working on retail packaging. Picture something along the lines of a iphone screen protector package that opens like a book.

A) Front of package has a diecut shaped window on the front. B) On the other opposite side of the front flap contains a second diecut shape window. Both have different yx locations.

C) Inside the package has a duplexed card that gets inserted into the package. The product sticks to each side and shows through the two diecut windows.

How do I make sure the insert cards line up perfectly to the front / inner front windows.

I will update if I can think of a better way to explain this.