thank you for clearing that up.
Yes, cousins; if you divide the gross tons by the double occupancy passenger capacity, you get the pax/space ratio.
It is a pretty good indicator, but by no means an exact science.
For example, the Regal Princess had a lower p/s ratio, but no ship I've been on felt as roomy. It has as much to do with how the decks are laid out as it does with actual volume of space.