Kanonneerboot K1-K3, 1938
These ships were Dutch gunboats captured before they were completed. The Germans took over construction and completed them. The drawings here depict K3 and an indeterminate one labelled "ontwerp", which I think is just Dutch for "design". At any rate, the "ontwerp" differs from the finished vessels.
Notice the different armament (40mm guns on ontwerp with an extra rangefinder aft, as opposed to 37mm/20mm on K3) and language ("Schaal" vs "Masstab" to connote scale).
Jacob v/d Burgh emailed to point out some things he noticed:
I found this while searching via Google for information concerning the Dutch K-series gunboats. Because I am Dutch and have a little knowledge of the class, I can perhaps clarify some points you made in the entry K3. The first drawing you have shows the Dutch design plans, while the second design is a copy of the Dutch plans with German modifications. This is clear because of three differences:
Now that I look carefully after reading Jacob's observation about the depth charge rack, I see that the German version retained the 4 minesweeping paravanes (delightfully called "otters" in German!) and replaced the stern depth charge racks with a pair of roll-off charges and a double bomb-throwing mortar with a second further forward. I'd say this would permit the German ship to throw a 12 charge pattern out.
German-navy.de has more information on the K3.