七對子, 門前清, 青龍 同埋 綠一色 are china style i believe
but Hong Kong style has 門前清 too = someone call it 不求人
青龍 i believe is 清一色 in stick only and 1 - 9 make it 青龍.
綠一色 is stick only with 發 = HK's 混一色
But Hong Kong style has no 七對子
參考: Memory from playing MJ with my Shanghai friends.