M72 toolbox
Comparison of the R71 and early M72 headlamp from Lutz Kraus
Here is a comparison of the pre-war R71 (1938) headlamp and an M72 headlamp from 1946. You will see that they are not so similar. Notice that the early lamps had used a pre-focus bulb like Indian and Harley-Davidson.
These bulbs were very common in those times but today they are very rare. The lens in the center of the glass is the different between the early Russian and the early Chinese lamp.