I may be repeating information already given, but I think the following is a good indication of why I would be concerned about determining the chap of the Marquis of Huntley in 1826 and the chap who died in 1880 would be same person without first sourcing some NSW bdm certificates ... of course, I would aim for official transcriptions ... The clue I would be seeking is for a place of birth for the Jacob, father of Abraham Myers.
Sept 1826 Convict Indents/Ships Musters
Jacob MEYERS aged
17,
born Amsterdam, Religion: Jew, House servant, single, Tried at London, 19 May 1825 for Pick Pocketing, previous convictions. Sentence Life. Arrived per Marquis of Huntley, 13 Sept 1826 to Sydney. Assigned to John HASSALL, Matavia.
1828 NSW census
Jacob Meyers, 19 years, Protestant, per Marquis of Huntley 1826
GS (Government Servant), Shepherd in household of Jonathn HASSALL, Newberry, Macquarie Plains, Bathurst District
1837
Ticket of Leave #0734
Jacob Myers, Allowed to remain in the district of Liverpool, tried London, per Marquis of Huntley, 1826
December 1837
Jacob Myers, 26, per Marquis of Huntley 1826
Assigned to Frederick Westmacott, Liverpool
RE : Jacob Myers died Waterloo NSW 1880
https://trove.nla.gov.au/newspaper/article/13461606 SMH 7 June 1880 .... late of Yass. In his 90th year.
The Friends of Mr Jacob
H MYERS ..... late residence, Pitt St, Redfern, opposite Cottage of Content Hotel ... to the Necropolis.
https://trove.nla.gov.au/newspaper/article/13461630 SMH 7 June 1880
MYERS.-June 5, at his residence, Elizabeth Cottage, Pitt-street, Waterloo, Mr. Jacob Myers, an old resident of Yass, in his 90th year.
https://trove.nla.gov.au/newspaper/article/70944630 Town & Country 12 June 1880
OBIT
Mr Jacob Myers, an old resident of Yass, and who was in business as a
butcher in Cooma, some years ago, died at Waterloo, Sydney, last Saturday, in his 90th year. Deceased was the father of Mr
Abraham Myers, of Queanbeyan, was one of the oldest
Freemasons in the colony and was always well respected by many friends.
https://trove.nla.gov.au/newspaper/article/114514400 Manaro Merc. 12 June 1880
Not sure how the chap who died in June 1880 can actually be confirmed as the one on the Marquis of Marquis 1826.
ADD notice there's an
Initial (H) for middle name JM