Is “Zhang Gongjin was a hero of Shunyi Village and a subordinate of Luo Yi.” true?

In the novel, Zhang Gongjin is portrayed as a hero of Shunyi Village, a sworn brother of Shan Xiongxin, and later serves under Luo Gong in Youzhou. For example, the twelfth chapter of Romance of the Sui and Tang Dynasties records: 'Zhang Gongjin was the local lord of this area.' However, in official history, Zhang Gongjin was initially a subordinate of Wang Shichong. For instance, the biography of Zhang Gongjin appended to the biographies of Yuchi Jingde, Qin Shubao, and Cheng Zhijie in the Old Book of Tang records: 'Zhang Gongjin, courtesy name Hongshen, was a native of Fanshui, Weizhou. He initially served as the prefectural governor of Wei Prefecture under Wang Shichong. In the first year of Wude, he and Cui Shu, the prefect of Wei Prefecture appointed by Wang Shichong, surrendered the prefecture to the state.' The two accounts of his origins are completely different.