We used to call the capitol of China “Peking.” I’m not sure when or why, but for years has been called “Beijing.” Yet, in a Chinese restaurant one still orders Peking duck.
Maybe if you were from few hundred years ago. The chinese characters are the same for both, only the pronounciation has changed through the centuries.
One would be a cultural significance the other would be it's current modernization form.
In mandarin, when you order peking duck. you acutally will say beijing roast duck.