Na'il bin Najih narrated a hadith like the previous one, once as marfu' (attributed to the Prophet) and the other time as mawquf (not attributed to him).
The hadith as Sufyan has it is in fact from Humayd al-Tawil, from al-Hasan, who said: "The Jew and the Christian have no right of pre-emption." This is what is correct: it is the saying of al-Hasan.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشفعة / 11593