Gaoping (249) — the same event in Records of the Three Kingdoms and Zizhi Tongjian

Records of the Three Kingdoms: While the emperor was visiting the Gaoping Mausoleum, Sima Yi dismissed Cao Shuang and others; Cao Shuang's faction…

What each source says

Records of the Three Kingdoms (Sanguozhi) · AD 249 · 高平陵

While the emperor was visiting the Gaoping Mausoleum, Sima Yi dismissed Cao Shuang and others; Cao Shuang's faction was destroyed to the third degree of kinship.

嘉平元年春正月甲午,車駕謁高平陵。
Location: 魏書 三少帝紀 (卷04) 嘉平1년

Zizhi Tongjian (Comprehensive Mirror) · AD 249 · 洛陽

Grand Tutor Sima Yi, by the order of the Empress Dowager, closed all the city gates, led troops to occupy the Arsenal, and sent troops out onto the floating bridge over the Luo River.

太傅懿以皇太后令,閉諸城門,勒兵據武庫,授兵出屯洛水浮橋,召司徒高柔假節行大將軍事,據爽營,太僕王觀行中領軍事,據羲營。
Location: 卷075 249년 단락0 제2문

Where the sources differ

A and B are two of the sources listed above.

On what pointSource ASource BWhat differs (in Korean)
WhoRecords of the Three Kingdoms (Sanguozhi)Zizhi Tongjian (Comprehensive Mirror)b는 황태후 령으로 성문 닫음

Place: 洛陽

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