why would Jem be compared to Jack Finch. Does this mean that scout is more like atticus

I don't think Jem being compared to Jack automatically means Scout is like Atticus. Really Jack isn't much different from his brother Atticus. By the end of the novel we see Jem maturing the most. He really reveres his father and seems to consider moral obstacles in a similar light. While Scout also matures, she still has her childlike "Scoutness" to her. Does this make sense to you?