A similar hadith is also narrated from Ibn Abbas (may Allah be pleased with them both) through this chain.
Related hadith on this topic
Explanation & Benefits
Hafiz Muhammad Ameen
1704. Commentary: The difference between the two is that in the first narration, three witr are mentioned as the action of the Messenger of Allah (sallallahu alayhi wa sallam), while in the second hadith, it is the personal action of Ibn Abbas (radi Allahu anhuma). By "difference," this is what the author (rahimahullah) intends. And Allah knows best.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 1704