Bianzhou (783) — the same event in New Book of Tang and Zizhi Tongjian

New Book of Tang: Li Xilie took the two prefectures of Bianzhou and Zheng.; Zizhi Tongjian: Li Xilie takes Daliang (Bianzhou).

What each source says

Li Xilie took the two prefectures of Bianzhou and Zheng.

庚午，李希烈陷汴、鄭二州
Location: 新唐書卷007 德宗·順宗·憲宗建中4年12月

Li Xilie takes Daliang (Bianzhou).

庚午，希烈陷大梁。
Location: 資治通鑑卷229

Place: 汴州