Is “In the Romance, Li Yan was sent by Fei Guan to meet the enemy, while the excerpt from the official history says he was sent by Liu Zhang to supervise the army and then led his troops to surrender.” true?

In Chapter 65 of the Romance of the Three Kingdoms, it emphasizes Fei Guan's dispatch: 'When Fei Guan heard that Xuande's troops were coming, he sent Li Yan out to meet them.' The Records of the Three Kingdoms, Book of Shu, Biography of the Former Lord, clearly states that he supervised the army and led his troops to surrender: 'Zhang again sent Li Yan to supervise the various armies at Mianzhu, and Yan led his troops to surrender to the Former Lord.'