considering the book and CD of Moths of Victoria Pt.2 (2nd Ed) the Separating Utetheisa sp page on CD says "Both species are variable in size and spacing of the dots on the forewing." It shows U. pulchelloides has a red dot adjacent to tornus, however while not mentioned in the text I note that the images of U. lotrix in book&CD have 4 red dots adjacent to the forewing inner margin while U. pulchelloides all have 5 - like this moth has.
U. lotrix and U. pulchelloides both have 5 red spots along the costa. The number differs only along the forewing hind-margin, the possible 5th (U. pulchelloides) at the tornus, see for example original drawing of U. lotrix by Pieter Cramer at Figure E (lower left corner) of https://www.biodiversitylibrary.org/item/95175#page/52/mode/1up
Yes, the markings, I understand it differ on the trailing outer forewing hind margin near the tornus. U. pulchelloides typically has 5 red marks along the hind margin, whereas U. lotrix lacks the fifth outer red mark, having only 4.