First of all, Yu Guangzhong's homesickness is promoted by the change of time and space. By describing homesickness at different stages, the author's longing for his hometown is expressed. However, Lan Shu's "Xiangsejiu" shows homesickness with a huge space-time span 30 years ago and 30 years later.
Secondly, the sentence patterns of homesickness are the same, and the emotional expression of the theme is emphasized through the repeated use of sentence patterns and rhymes. Country color wine compares the scenery 30 years ago with the scenery 30 years later, expressing the author's yearning for his hometown.
In addition, Nostalgia and Nostalgia Wine both use the change of time and space to construct poems, but Nostalgia expresses the author's mood by describing homesickness at different stages, while Nostalgia Wine expresses the author's mood by comparing the scenery before and after 30 years.
To sum up, the similarities and differences between Nostalgia and Xiangsejiu are mainly manifested in the temporal and spatial changes and the use of sentence patterns.