The narrations stating that they came after the conquest of Khaybar are more authentic. And not giving him a share was his (peace and blessings be upon him) intention that "the distribution is for whoever was present at it"; and it is possible that he included them in the shares with the people's consent.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12924