I have read the original newspaper announcement several times - it doesn't suggest New South Wales. It suggests the Phillippines:1. It's Manila with one L2. The deaths were in April and May 1850 but not learned of in Sydney until September
There is a record for the death of a George Brown in Manila Nat Archives/GRO Overseas Deaths 1849-1854 - Vol 1 Page 703It might be him.Gadget
I posted this yesterday at 10.55