Why are the poems of Wang Yucheng and Du Fu similar?

Wang Yucheng once wrote a seven-character quatrain: two peaches and apricots reflect the hedge and decorate the home of Shangzhou's deputy envoy. Why the spring breeze can't be tolerated, and the silk blows off a few flowers. His son Wang Jia felt that the last two sentences of this poem were too close to Du Fu's poems, and advised him to change them. Wang Yucheng not only did not change, but was happy because his son Wang Jia saw that his poems were similar to those of Lao Du. He also wrote two poems to laugh at himself: "Ben Letian is backward, but dare to be beautiful?" The last two sentences of Wang Yucheng's poems are really borrowed from Du Fu's poems. Du Fu's "Wandering", the second of nine: planting peaches and plums by hand is not ownerless, and the old wall is still home. Just like the spring breeze deceives each other, blowing off a few flowers at night. Du Fu's poems seem to be handwritten, and indeed belong to the category of "rambling". As far as its ideological content is concerned, it only writes about the poet's faint sadness.