Hi Steve,
After reading your thread with interest ( I had a similar ancestor, my 5 times GT Dad) , its a classic question - do you take the chance you have the right death certificate copy of the right deceased after the person had moved around a lot in their passed life and dyeing so young with a questioning why. CarolW was right ! its always a gamble buying a certificate but unless there was a serious event like an accident worthy to be reported in a newspaper, also dying young with health issues was not that uncommon and deadly virous's about them years, mostly only basic info of a deaths were reported in the birth, marriages and death sections in newspapers.
I sent for my 5 times Gt Dad aged 51 years (a Blacksmith) death certificate copy 1841 , cause of dead was as it looked like read being poor writing - saying "accident with a Clit wheel", thinking it was an accident in his job with some kind of machine grinding wheel or like of ?, I did not push further , but years later found out it was a " accident being run over by a cart wheel" after a horse stampeded in a country lane and the local parish newsletter was full of the event. Thus for such a nominal death certificate copy cost gamble - certificate info do give a firm start as wether to search further or not..