His father: In Chapter 91 of the Romance, Xiahou Mao is a son of Xiahou Yuan who as a child was adopted as Xiahou Dun's son and became his heir. The Records names Xiahou Mao as a son of Xiahou Dun, and the one who succeeded Xiahou Dun was his son Xiahou Chong. Romance, Ch. 91 §48–49Records, Wei 9 §9
Courtesy name: Chapter 91 of the Romance gives his courtesy name as Zixiu. Chen Shou's main text does not record Xiahou Mao's courtesy name. Romance, Ch. 91 §49Records, Wei 9 §9–10
Marriage to Princess Qinghe: In Chapter 91 of the Romance, after Xiahou Yuan is beheaded by Huang Zhong, Cao Cao takes pity on Xiahou Mao and gives him his daughter Princess Qinghe. The Records says only that earlier the Grand Progenitor had given a daughter in marriage to Xiahou Mao, without giving the reason or the time. Romance, Ch. 91 §49Records, Wei 9 §9
How he came to command west of the passes: In Chapter 91 of the Romance, Xiahou Mao asks on his own to go on campaign, becomes Grand Commander, and gathers more than 200,000 troops from west of the passes. The Records says only that he served as Palace Attendant and Master of Writing and as General Who Pacifies the West and General Who Guards the East and was granted the Tally, without saying when or in connection with what he held these offices. Romance, Ch. 91 §49–51Records, Wei 9 §10
Capture at Nan'an: In Chapter 92 of the Romance, Xiahou Mao is defeated at Mount Fengming, flees to Nan'an, and is captured by Wang Ping. The Annals of Emperor Ming and the Biography of Zhuge Liang in the Records say only that when Zhuge Liang came out to Mount Qi, the three commanderies of Nan'an, Tianshui and Anding rebelled against Wei and went over to Zhuge Liang, and Xiahou Mao does not appear. The record of Xiahou Dun has nothing of this either. Romance, Ch. 92 §23 · 41Records, Wei 3 §8Records, Shu 5 §32Records, Wei 9 §9–10
Who resisted Zhuge Liang: In Chapters 92–93 of the Romance, Xiahou Mao first leads the Wei army and is defeated, and only then does Cao Zhen become Grand Commander. In the Annals of Emperor Ming in the Records, the General-in-Chief Cao Zhen commanded the region west of the passes and the General of the Right Zhang He routed Zhuge Liang at Jieting; in the Biography of Zhuge Liang, Cao Zhen held off Zhao Yun and Deng Zhi at Ji Valley and Ma Su was defeated by Zhang He at Jieting. Romance, Ch. 92 §12Romance, Ch. 93 §32Records, Wei 3 §8Records, Shu 5 §32–33
Jiang Wei's surrender: In Chapter 93 of the Romance, Zhuge Liang releases Xiahou Mao to summon Jiang Wei and deceives Xiahou Mao and Ma Zun with a soldier disguised as Jiang Wei. In the Biography of Jiang Wei in the Records, the Administrator of Tianshui suspected Jiang Wei and the others of disloyalty and fled by night to hold Shanggui, and Jiang Wei and the others, unable to enter the city gate and not admitted at Ji County either, went together to Zhuge Liang. Xiahou Mao does not appear. Romance, Ch. 93 §15 · 19Records, Shu 14 §29–30
Liang Xu and Yin Shang: In Chapter 93 of the Romance, when Xiahou Mao says inside the city of Tianshui that the two must be killed, they judge that matters are urgent, open the city gates and let in the Shu troops. In the Biography of Jiang Wei in the Records, the Officer of Merit Liang Xu and the Registrar Yin Shang accompanied the Administrator on his tour of inspection together with Jiang Wei and went to Zhuge Liang together with Jiang Wei. Romance, Ch. 93 §27–28Records, Shu 14 §30
Year of the campaign: Chapter 93 of the Romance places the arrival of the report that Xiahou Mao had lost three commanderies in the 1st year of Taihe of the Wei ruler Cao Rui. The Annals of Emperor Ming in the Records records the rebellion of the three commanderies after the entry for the first month of spring in the 2nd year of Taihe (228), and the Biography of Zhuge Liang places it in the spring of the 6th year of Jianxing (228). Romance, Ch. 93 §30Records, Wei 3 §7–8Records, Shu 5 §32
Afterwards: In Chapter 102 of the Romance, Cao Rui says that Xiahou Mao lost many men and horses and is still too ashamed to return. The Records has no record of Xiahou Mao fleeing into Qiang territory, and it records that he served as Palace Attendant and Master of Writing. Romance, Ch. 102 §8Records, Wei 9 §10