it seems akin to the difference between a restrictive and non-restrictive relative clause. for example:
non-narrowing: Lil ela kac. Kak isuca. → All of the cups, which I own, are full. (I own every single cup that exists, and they are all full)
narrowing: Lil ela kalc. Kak isuca. → All of the cups which I own are full. (this is exclusively a statement about the cups which I own)