Sorting list A by list B follow the value of X and Y

Hi,
I want sorting list A by list B follow the value of X and Y, I saw the solution follow this topic Sorting Curve List A by Curve List B .But i get a problem, my lists have some element have same value, so i doesn’t work correctly. Can anybody help me?

Try using sort by key and the key will be. X from list b then. Y

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