not both.

The spoken and written name are different. There're two kinds of written Chinese character sets:

1. Traditional Chinese(local: zh-tw) mainly used in HONGKONG, TAIWAN, overseas Chinese. because it's used in old days, so people who left the country early did not have the chance to learn the simplified one. many of the people in HONGKONG came from Canton, so they usually speak Cantonese. However, Taiwanese did not speak Cantonese, they speak Mandarin, write and read in Traditional Chinese.

2.Simplified Chinese(local: zh-cn) mainly used in mainland of China, people speak Mandarin(a little different accent from Taiwanese), write and read in Simplified Chinese;

yes they have many parts are interchangeable, I can also provide Traditional Chinese if asked, but I'm not native speaker.