Think we are onto something as John is a landed proprietor at Sundrum which seems to have been Sundrum House or Castle at various times. Looks they are of the gentry and Hugh could have been sent away to school? I am having trouble finding them in the 41 at all but am at work so will look later.
Yes, I'd say there is a bit of class difference between the Hugh in Parramatta with a bio of his son and my Hugh, the farmer in Dayboro, Queensland. Although my Hugh did get the location where he farmed named after him - at least for a few years.