Pingcheng (423) — the same event in Book of Song, Book of Wei and Zizhi Tongjian

Book of Song: The Wei ruler Tuoba Si died and his son Tuoba Tao (Emperor Taiwu) ascended the throne.; Book of Wei: Mingyuan died in the Xigong Palace…

What each source says

Book of Song (Songshu), Annals · AD 423

The Wei ruler Tuoba Si died and his son Tuoba Tao (Emperor Taiwu) ascended the throne.

是歲,魏主拓跋嗣薨,子燾立。
Location: 宋書 卷4 景平1年 10月

Book of Wei (Weishu), Imperial Annals · AD 423 · 平城

Mingyuan died in the Xigong Palace at the age of 32.

十有一月己巳,帝崩於西宮,時年三十二。
Location: 魏書卷3·泰常八年

Zizhi Tongjian (Comprehensive Mirror) · AD 423 · 平城

Northern Wei Taizong died, and Shizu (Taiwudi) ascended the throne (in the eleventh month).

己巳,魏太宗殂。壬申,世祖即位,大赦
Location: 卷119

Place: 平城

Show on the map — open Book of Song (Songshu), Annals