Hibbertias are pigs to ID even in the hand. You need at least good photos or field notes stating how many ovaries/styles there are, whether the ovary(s) are hairy or hairless, and good photos of the sepals. Etc. About half the species in NSW are not in the Plantnet key, and the Plantnet descriptions are often out of date.
Yes we have a few in the Heathland reserve and a number of different ones they are difficult to ID Nick has given me some pointers which I will refer back to.