They barely even share that. The word for "not" in Mandarin is 不是, but in Cantonese it's 唔係. "Book" is 书 in Mandarin, but 冊 in Hokkien.

There are enough differences between the various "dialects" in both the spoken and written form, that there's a debate as to whether they should be considered "dialects" at all, or a separate language altogether.