The Turkic Mochuo Khagan was killed by… (716) — the same event in Old Book of Tang and New Book of Tang

Old Book of Tang: The Turkic Mochuo Khagan was killed by Gusheng Bayegu and his head was sent to the capital.; New Book of Tang: Hao Lingquan, Prince…

What each source says

Old Book of Tang (Jiu Tangshu), Annals · AD 716

The Turkic Mochuo Khagan was killed by Gusheng Bayegu and his head was sent to the capital.

癸酉,突厥可汗默啜為九姓拔曳固所殺,斬其首送於京師。
Location: 舊唐書 卷8 開元4年

New Book of Tang (Xin Tangshu), Annals · AD 716

Hao Lingquan, Prince Commander of the Dawu Army, killed the Turkic Khan Mochuo.

大武軍子將郝靈佺殺突厥默啜
Location: 新唐書 卷005 睿宗·玄宗 開元4年6月

Where the sources differ

A and B are two of the sources listed above.

On what pointSource ASource BWhat differs (in Korean)
WhoOld Book of Tang (Jiu Tangshu), AnnalsNew Book of Tang (Xin Tangshu), Annalsa는 구성 발예고 / b는 대무군 자장 학령전
Show on the map — open Old Book of Tang (Jiu Tangshu), Annals