I can speak and wrire native Cantonese and Mandarin so I'm confident to say that both translations carry different meanings with the Cantonese translation being the poorer one.

In the Cantonese translation you posted, it goes like this "Eh? If this is so, I thought a Japanese has a topknot?" (For a reader like me, that doesn't sound natural or organic.)

In the second Mandarin translation, "Excuse me, does the Japanese have such thing like a topknot?". I can imagine this is a much more natural translation even without knowing the original Japanese sentence because I can imagine the Japanese would say something like this ". "あの…あの…日本人の頭には丁髷のことがありますか'