Tea culture: Cantonese and North Vietnamese have some very complex tea drinking cultures. South Vietnamese people use coffee instead of tea, and people in the three regions like to make milk tea.
茶文化：广东人和北越人都有一些非常复杂的饮茶文化。南越人用咖啡代替茶，三个地区的人都喜欢泡奶茶。
Festivals and celebrations: Lunar New Year (calendar slightly different), lion dance, New Year flower market, Mid Autumn Festival, every Buddhist celebration/festival, Dragon Boat Festival, etc. However, Vietnamese celebrate in a slightly different way.
节日和庆祝活动：农历新年（日历略有不同）、舞狮、新年花市、中秋节、每一个佛教庆典/节日、端午节等。不过，越南人的庆祝方式略有不同。
Religion: Both believe in ancestor worship and combine Mahayana Buddhism, Taoism and Confucianism, becoming the most popular religion. But neither is very religious.
宗教：两者都信奉祖先崇拜，并结合了大乘佛教、道教和儒家思想，成为最受欢迎的宗教。但两者都不是很虔诚。
In a word, the cultures of Vietnam and Guangdong are very similar, but they differ greatly from each other.
总之，越南和广东的文化非常接近，但彼此之间的差异很大。
越南华裔网友Tim Tran的回答
They both look alike. But when you look deeply at the two, they are very different.
他们两个看起来都很相似。但当你深入观察二者时，就很不一样了。
-Language:
-语言：
Cantonese and Vietnamese speak a tonal language. The voice follows the rhythm closely. There are more syllables and stresses than Mandarin. However, Vietnamese grammar is opposite to Cantonese grammar and word order. In Cantonese grammar, the University of Finance and Economics is "Economics University of Finance and Economics", and in Vietnamese, "University of Finance and Economics"（ Đ ại học Kinh Tế))”.
广东人和越南人讲的是有声调的语言，声音紧跟节奏，比起普通话有很多音节和重音。但越南语语法与粤语语法和语序正好相反。财经大学在粤语语法中是“Economics University财经大学”，越南语是“大学财经University Economics(Đại học Kinh Tế))”.
-Food and Delicacies:
-食物和美食：
Many Vietnamese foods are popular in Guangdong, such as:
许多越南食品在广东地区很受欢迎，比如：
