Suppose I'm cloned when I am alive. Provided there is a technology that can copy ALL my mental states into the clone, such as memories, values, beliefs and the like. No more, no less. Also there is technology to produce the same body as me for the clone: same age and same structure. Now the clone stands in front of me. I will say 'I'm not the same person as this clone. we are two different persons.
Everyday I'm in the process of metabolism. My body(including my brain) is different from the one yesterday. My mental state can be said to be inherited from the one yesterday, But my metabolism doesn't make me a different person. I still think I'm Zhihao Wang regardless of whether this happens yesterday or today.
So what's the difference between metabolism and cloning in this case?