Both are asking someone's nationality in different ways. 어느 나라 사람입니까? = 어느 나라에서 왔습니까? = 어느 나라 분이세요? = 국적이 어디세요? \^o^/

Hi I am Cesare from Italy , study English

I think both of two meaning are same. = "where are you from?" so, you can answer your country when you are asked.