I've seen several recipes of the two pies and even then I don't know if there is an original.
Usually in Dutch Pie in Brazil, picture here, I see it based on a dough made with melted butter and crushed crackers. As filling a crème pâtissière and a dark chocolate ganache.
In German Pie in Brazil, picture here, I never found something "canonical", but usually see it surrounded with chocolate-covered cookies. In fact, I don't know which is used in this pie filling and which procedure should be taken to do it.
Best Answer
The one called, "Dutch pie" is typically a very smooth pie on a cookie base. The one called, "German pie" generally has a layer of crushed nuts on top of the smooth chocolate icing.