Hong Kong drives on the left, China on the right.
Hong Kong has it's own currency: the Hong Kong Dollar.
Hong Kongers need a visa to travel to China, semi-vise versa.
Hong Kong is free and democratic, China is communist with differing laws.
Hong Kong's official languages are English & Cantonese, China's is Mandarin.
Hong Kongers hold a Hong Kong passport, China people hold a Chinese passport.
Hong Kong has various systems differing to China's - including education & healthcare.
Hong Kong is categorized on it's own (seperate from China) by various institutions worldwide.
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