Both records seem to be on Ancestry. However-I'm getting different death/burial dates.
England, Select Deaths and Burials, 1538-1991
The Otterbourne chap was buried 9 Jul 1851.
The man aboard the Tartar:
in the UK, Registers of Births, Marriages and Deaths at Sea, 1844-1890
didn't die until 24 Jul 1851.
Maureen