What's the difference between "bang" and "le" in Cantonese?

The difference is that the context is different and the frequency of use is higher.

The following is a brief introduction to Cantonese:

Its name comes from China's ancient name "Yue" for the coastal area south of the Yangtze River. In ancient books, yue means yue, which was very common in ancient times. For the tribes in the coastal areas south of the middle and lower reaches of the Yangtze River, they are generally called "Yue", and in the literature they are called Baiyue, Baiyue and Zhu Yue.

Guangdong is called "Nanyue" in Historical Records and "Nanyue" in Hanshu. After Sui and Tang Dynasties, the meanings of "Yue" and "Yue" began to differ. The former is mostly used in Jiangsu, Zhejiang and Wu-speaking areas, while the latter is mostly used in Lingnan and Guangdong areas, which has long been a general term for Lingnan areas. Later, the appellations of Guangdong and Guangxi were distinguished. "Guangdong" refers to Guangdong, and Guangxi is called "Guangxi" for short.

Please refer to Baidu Encyclopedia-Cantonese version for the above information.