without dis-secting the genitalia, there is no way to be certain on any of the Arctornis spp. id in HK.
Tony Galsworthy dis-sected a dozen specimens of what looked to be the same species a decade or so ago - they were all different!!
Thus from photos, it is only possible to say Arctornis sp.
The species for Hong Kong are yet to be determined - without seeing the paper in which Inoue described kanazawai and comparing it to material from Hong Kong, I'd be very reluctant to say it occurs in HK.
A secondary problem is that without rearing males and females from the same batch of eggs, it is not realistic to determine which male matches which female! What is known is that there are at least 12 different Arctornis species in Hong Kong.
Any offers to do the genitalia dis-sections and comparative work will be gratefully received!!