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I have put pictures of Carpophthoracidia matsumotoi I found from literature with image of suspected C. bivittata collected recently side by side for easy comparision. Apparently there are subtle difference to tell the two apart.

In Xu, Liao & Zhang's paper (Two new species of Trypetinae from Guangdong, China (Diptera, Tephritidae). Acta Zootaxonomica Sinica34(1):69-72) the authors remarked that C. bivittata is similar to C. matsumotoi from Ryukyu Island but is clearly distinguishable from the latter by the scutum with only 2 longitudinal reddish yellow vittae (4 vittae in C. matsumotoi).

There is a good chance that both species are occurring in Hong Kong.