Yes the underside (first image) matches the image for this species on NatureMapr, but the entry for Salma marmorea on AFD is 'No exact matche for this species'.
Searching for Salma marmorea on ALA offers Stericta marmorea but does not list it as a synonym https://bie.ala.org.au/species/https://biodiversity.org.au/afd/taxa/0d759d39-8b47-4f29-a147-0a798d8d4ee9 https://tasmanianinsectfieldguide.com/hexapoda/insectsoftasmanialepidoptera/superfamily-pyraloidea/pyralidae/genus-salma/salma-marmorea/ On his site Don says Salma marmorea is a former name for Stericta marmorea. I cannot open AFD. Maybe we need to put it in this basket and see if the answer turns up down the line. iNat is using Salma marmorea https://inaturalist.ala.org.au/observations?taxon_id=931752