Hi Glenn,
Yes they are both visible although only the end of the port aft container protrudes from under the lower platform.
Picture 2A shows the port 3.7cm barrel container, 2 ready ammo lockers, port upper platform 2cm mount with left gun only and no shield. Boat has been painted since surrender.
Picture 4A shows port aft tip of 3.7cm barrel container, starboard aft life boat container, M42 twin 3.7cm with LM42U mount on lower platform along with 2-3 ready ammo lockers and starboard upper platform 2cm mount with shield and no guns, 1 ready ammo locker centre aft of upper platform with no protective plating on the side, picture taken after surrender, before repaint.
Still looking for a decent picture of the lower platform from above to confirm 2-4 life boat containers as fitted to U 534 see wintergarten 6, and yes the U 534 had 4 ready ammo lockers with rounded side protection and like U 190 an unprotected ammo locker on the upper platform.
Regards
Jon