Twining shrubs; leaves mostly narrowly elliptic or ovate with flat or undulate margins; pedicels slender, pendulous or curving, 12–45 mm long in flower, often extending in fruit; ovary and fruit glabrous or rarely pubescent B.mutabilis
Ascending shrubs; leaves c. oblong, usually with distinctly recurved margins; pedicels stout, erect or sometimes pendulous, up to 12 mm long in fruit; ovary and fruit densely villous B.scandens
The recurved leaf margins and relatively oblong leaves should make this scandens i think
In my point of view, with this, your sighting here, i would like to see the internal structure of the fruits to have a sure and confirmed identification .
Ref's (in brief links only, without much of the citations):
Flora of NSW online PlantNet: • https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Billardiera
Plants of South Eastern NSW: • https://apps.lucidcentral.org/plants_se_nsw/text/entities/billardiera_mutabilis.htm • https://apps.lucidcentral.org/plants_se_nsw/text/entities/billardiera_scandens.htm
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