These issues can be distinguished only by their German East Africa cancels.
One copy of the 1 Mark value (MiNr. 1 f) was known to exist, but it has not been seen since WWII, and is believed to have been lost or destroyed during the war.
The post offices were under orders to use the stamps only on official parcel post cards. The stamps were not to be sold to, or used on mail addressed to, private parties.
However, the cover shown below is addressed to the Catholic Bishop in Bagamojo. It originated at the Catholic mission in Bahi, which was near Dodoma, and the 3 Pf Germania stamps are likely from Dodoma’s stock of 100. It was cancelled on a train of the Mittellandbahn (Central Railway), which ran through Dodoma. This is likely a unique item, as it contains both a rare private use of the provisional stamps, and a railway cancel, which would not be normal with the proper official use of these stamps.