Is Gaozhou dialect the same as Yulin dialect?

It's different. According to relevant public information, Gaozhou dialect and Yulin dialect are two different dialects. Gaozhou dialect is a dialect in central Guangdong province, mainly distributed in Gaozhou city and its surrounding areas, Maoming city, Guangdong province, while Yulin dialect is a dialect in Yulin city and its surrounding areas, Guangxi Zhuang Autonomous Region. Although both dialects belong to the Chinese language family, they have different characteristics in vocabulary, grammar and pronunciation.