how is the situation in Ireland with the Protestants and catholics different in term of nationalism when compared to the conflict in Israel/Palestine?
Ireland is an independent nation, although it was ruled by Britain for many years until it became independent in 1921. However, the northern six counties has remained part of the United Kingdom of Great Britain and Northern Ireland since then.
Northern Ireland is mostly Protestant, while Ireland is mostly Catholic. The conflict comes because Ireland wants to claim all of the island as one nation, while most people in Northern Ireland want to remain part of the UK.
Both are prosperous, whereas in the Israel/Palestine conflict, Israel is prosperous and Palestine is poor.