美式足球與欖球

1.美式足球要着堅甲 中式欖球唔使着堅甲

2.美式足球入咗有3分 中式欖球得2分

3.美式足球到咗底線有6分 中式欖球得5分

they are vastly different game, only thing similar is the shape of the ball, even that has significant difference. See below link, good simple comparison.

Hope you find use for it.