The other difference with cargo is that a deceased body has to be accounted for as a person on the flight plan!
With the travelling retired baby boomer people getting older, it will be interesting to have a morgue for LROPS with A 340 and A380.... as statistics for having a deceased person arising in flight's going to increase with the lenght of flight, number of people on board and ageing of population....
(sorry for english faults... not my first language...)