In WWII the canals of Western Europe and particularly German were very important. With American and British fighting roving the skies, it because difficult for trains and truck convoys to move around due to destroyed rails and bridges. One way to avoid that was to use barges. Transportflotte Speer wore generally naval uniforms and ran barge transports.
This pair just has the new arms, no new head. The mixture of uniform headwear reflects the more casual nature of these small crews.
Two sets of these figures to allow a few boats to signal each other.