Protestant churches use both denominations for the office, Pfarrer and Pastor. It depends on the church which is used. Protestants have no special style for priests as every faithful Christian has priesthood in the Protestant view."Pater" is used, but only when addressing monk priests.
Else you would use "Herr Pfarrer" (probably "Herr Pastor" in Germany??) or "Hochwürden"; difference is in style, in Ausrian rural regions the most typical form would be "Herr Pfarrer".
Well, at least in my experience we don't really distinguish - we just say "Herr Pfarrer" to address a priest, and "Hochwürden" when we want to be very formal.In the Catholic Chruch, Priester and Pfarrer is not the same thing. The former is a state and the latter is an office. To which of the two does the style "Hochwürden" apply?