Whats the difference between H and HH gty?

I am in the process of booking a cruise and am curious what the difference between a guaranteed ocean view cabin in category code H or HH? The ship is the Norwegian Majesty, which has no verandas. The HH has a slightly higher ticket price. All I can think of is perhaps the H category ones are partially obstructed or bunk beds? Which would be the better one to book since they are both gty?

I would like to know the answer, too. I looked at Virtual Tours USA and got a better idea.

The NCL website gives info, too, but the description there is identical for both: porthole window, no fridge etc. both on bottom deck. Both 152 sq ft.

Placement of where the cabin is located on the deck. the "H" cat has a porthole instead of a regular window.