Is Arab Nationalism different than Nazism?

Yes very much, look up Arab nationalism under Egypt's years in the fifties. Or look up nationalism in Tunisia there it accounted for 95% literacy for both females and males. then there is Algeria. Notice these are north African Arab nations too with more moderate governments after colonialism. As far as the Baath party maybe but look what was Christian Falangists in Beirut these parties are nationalist but fighting other parties over secularism in their countries.