Transylvanian Churches

Below are two churches in Transylvania that seem to be at one time very similar and yet, very different. One is found in a village-- still standing, and one is in a major city with history attached to it, due to the Reformation

Above is the Black Church.

Above is the Heidendorf Church.

Both at one point had Lutheran congregations, and now both are either historical sites or have been renovated, can you tell which one?