The Master Staterooms of both the A and B Versions are fitted with the same Island Queen, the same Hanging Lockers and Great Storage under the berth. The difference is: the aft bulkhead of the Version A continues the full width of the stateroom, starting at the after edge of the hanging lockers - there is a door just off center to port opening into the Galley.
The Version B Master has an “Ensuite” Head, with the Vanity acually right inside the stateroom and the Shower and WC are in their own private space. The Heads in both versions are located in exactly the same spot and take up the same total space; that of the Vers B allows for more floor space INSIDE the stateroom.

The Island Queen berth (right) is the same in both versions. Note just a corner of the vanity in the lower left of the photo - this is a Version B Master and we’re looking in from the doorway.

Left is the Version B Head - you’ll note that the Vanity area is a part of the Master, with the WC and Shower in their own room. Just to the left of the vanity, is a short vestibule leading aft to the doorway.

Compare a Version A Head with the B one above. The relative positioning is identical; the difference is that here the Vanity, WC & Shower Stall are ALL in the same space.

Looking from on top of the starboard hanging locker, you get an idea of the tremendous amount of countertop available - underneath this expanse of counter is an equally large hanging locker and chest of drawers. The GH37 Master has 4 opening portlights and 1 opening deck hatch, all fitted with screens.