There is no difference. "Green Water" and "Green Mountain" are coordinate words, and the change of order will not affect the change of meaning. Green mountains and green waters refer to beautiful mountains and rivers. The source of green mountains and green waters is Tang Wangwan's "Down at the North Fort Mountain": "Under the green mountains, I am boating with green waters." Beyond the lush mountains are roads for tourists, and ships sail in green waters.
2. In modern poetry, there is Mao Zedong's "Seven Laws and Two Gods of Distress": "There are many green mountains and green mountains, and Hua Tuo is helpless!" The south has always been green mountains and green waters with beautiful scenery. Even Hua Tuo couldn't resist a small schistosomiasis, which eclipsed the killing of great rivers and mountains.