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Limit the items in a collection depending on another collection

Hi guys!
Is there a way to limit the items in a collection depending on how many items are in another collection?
There two collections on this page and i cant show more than 4 items in total at a time or they won’t fit in the viewport.


So i want the similar proj collection to depend on the author proj collection. If theres 3 author proj items, there can only be 1 similar proj item, if theres 1 author proj item, there has to be 3 similar proj items and so on…


Here is my public share link: LINK