What are the similarities between Putonghua in Taiwan Province Province and Putonghua in Chinese mainland?

After the founding of New China, Chinese mainland's Putonghua was further standardized and determined by the State Council, with Beijing dialect as the standard pronunciation and northern dialect as the basic dialect.

Taiwan Province Province also speaks Beijing dialect, but it is quite different from Mandarin. In the early years of the Republic of China, Beiping dialect was renamed as "Mandarin" and became the common language of the Chinese nation. After the Kuomintang retreated to Taiwan Province Province, it set up a "Mandarin Promotion Committee" to study and promote "Mandarin". Because there are many people from other provinces, such as Jiangsu, Zhejiang, Fujian, Guangdong, etc., Taiwan Province's "Putonghua" is influenced by Jiangsu, Zhejiang and Minnan dialects, with an obvious wuyue accent.

The most obvious difference between the two is tone. There is no difference in the tone of 1234 in Taiwan Province Putonghua, so it sounds awkward and a bit strange.