Hi, what i can tell you is my forward cabin on 2007 bav 30 , had a lovely memory foam cover which everybody raved about how comfortable it was, so i kept it when i sold the yacht last year and put it into my 2002 Bavaria 37 front cabin. its a bit smaller but no more than 50mm.
Hope this helps.
The rear cabin is wider on the 30 by quite a bit, and you can easily sleep across the berth!
rgds Ray