I would guess they are the same except Sighting 4422388 which is too blurry for me to see the detail at the rear end. On iNat there is a 2nd one, T. flavofasciata, but not verified. The explanation given for T. flavofasciata was "This appears to be Trigonothops flavofasciata, a species with many records from Victoria on the Atlas of Living Australia, see here. My ID is based on illustration J on page 701 of Australian Beetles Vol 2 Editors - Slipinski & Lawrence Another species to add to the database please @thebeachcomber. I see you have assisted with an ID on a post of a related species, see here which is similar to, but not matching T. pacificus based on another illustration, this one in Australian Beetles Vol 1 page 257 G" I don't have the book to check and neither are in the CSIRO Insects of Australia 2nd edition. Not having any qualifications in the subject, I can't confirm the id so pehaps leave as Trigonothops sp until you have an expert look at them or it is clear in Australian Beetles V1 if you have access to a copy..
PS. On ALA, two of the photos of Trigonothops pacifica belongs to Dianne, see: https://bie.ala.org.au/species/https://biodiversity.org.au/afd/taxa/3f0298b1-b877-4d74-93b3-15e3b737e4f6#gallery