There’s a difference.
A leer is intrusive, objectifying, nearly hostile. The content is, generally, “I like that. I want that.” Without reference to what that might want.
A hungry look, on the other hand, is deeply respectful. Its content is, generally, “Ooh, you look good. Thank you for feeding me visually. I wonder if, I hope that, you appreciate my desire for you, and, ideally, that you reciprocate. Please tell me you want me like I want you, that you want to feed me, to give me what I want.”
Sometimes, I leer. When I do, it’s because I’m lost in my head, alone, sad.
More often, I’m hungry.