It could easily have been a PPD sub gun in the picture, it's in the last 10 pics or so of the 150 in that album, it looks like a German Officer with a soft hat, and it's slung on his back muzzle down, so it's difficult to see which type it is. It is definitely a Soviet sub gun with a drum magazine however, with the vent shielding around the barrel and such. I know that early in the war the PPd was far more prevalent than the PPsh, and was in service long before it. I just can't tell from the picture which it is. The PPd, like the Finnish sub, was actually better built than the PPsh, but because of this was also more difficult to mass produce as well. Both the PPd and PPsh performed very similarly, with around 1000 rpm cyclic rates, and firing from open bolts. The PPd was a select fire weapon too, and was apparently quite accurate out to 150 meters or so.
If those pics are from the early 1941 time period during the Barbarossa time period prior to the winter coming, that pic of the PPd is fairly rare, as under 100k of the PPd were ever produced, while the PPsh I've seen numbers estimated as high as 10 million being made, with most historians agreeing that 5 million is the likely number. Pew Pew Pew!