This specimen looks similar to Sighting No. 3410727. Although that sighting was regerded as being close to C. catastreptes, both this specimen and that sighting share a backward pointing double-peaked 'bubble' in the second main line of the forewing which. C. catastreptes mostly lacks.
I agree this is the same as 3410727. I think that neither matches any of the 12 species of Chloroclystis illustrated in the Coffs Butterfly House webpages, so it is likely to be one of the other 28 species of Chloroclystis listed in the Checklist that are not illustrated there