"How come ...?" vs. "Why don't ....?"

Hello, teachers!
Could you please tell me the difference in meaning when we use 'how come ...' and 'why don't .....'? Do they have exactly the same meaning?

1. How come you don't eat/finish those left-over potato chips? / Sorry, I'm already full. I can't have any more.

2. Why don't you eat/finish ...


Thank you very much.
Enjoy twinkling stars in the dark sky.
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