The first pic looks like a later Balao style Conning tower, not a Gato tower, as depicted in the game image. Also the scale seems about the same; if you take the aft flak gunner and place him in front of the forward flak position he appears on scale with the sailors in the photograph.
The refit modifications are not all universal, as in looking through photos i've seen various versions of conning tower modifications; dependind on the timeframe in which they were performed.
Not to mention people were alot smaller in those days.
SH4 depicts more than one Conning Tower Refit as well; this image better fits the one in your photo (Balao style) where the upper section is cutdown more, as evidenced by the exposure of the Periscopes.
