sentence 1: How do I know if I'm good?
 sentence 2: How do I know what I'm good at? sentence 1: Does intelligence really differ from person to person?
 sentence 2: Why does intelligence differ from one person to another? sentence 1: Who makes us laugh more, Rowan Atkinson or Jim Carrey?
 sentence 2: Who makes us laugh more by their acting: Rowan Atkinson or Jim Carrey?
not same meaning
same meaning
same meaning