What's the difference between Hongya dialect and Meishan dialect and Leshan dialect?

Take the Minjiang River as the boundary. To the east and north of Minjiang River, immigrants from Hunan and Hubei first covered Chongqing, then continued to the west and finally arrived in Chengdu. These immigrants are distributed in Chongqing, Nanchong, Chengdu and the northeast of Chengdu, and the Sichuan dialect they formed is called Huguang dialect. Due to the barrier of the Minjiang River, Zhang, west and south of the Minjiang River, suffered less war damage and fewer immigrants, and the Sichuan dialect that existed before the Ming Dynasty was preserved. For example, Dayi, Qionglai, Wenjiang and Leshan, from Zigong along the river to Yibin and Luzhou, people in this area speak Sichuan dialect, that is, Lu Nan dialect.