How can the different narrations in the three hadiths regarding the change of Qibla be reconciled—the hadith of Al-Bara' ibn 'Azib in Bukhari, and the hadith of Anas ibn Malik and 'Abdullah ibn 'Umar in Muslim—concerning the time and place of informing the worshippers and their state during prayer? And do these narrations describe separate incidents or a single incident?

Yes, the hadiths indicate two different incidents regarding the change of the Qibla: The first was in the mosque of Banu Harithah during the 'Asr prayer, as narrated in the hadith of Al-Bara' bin 'Azib (may Allah be pleased with him). The second was in Quba Mosque during the Fajr prayer, as mentioned in the hadiths of Ibn 'Umar and Anas (may Allah be pleased with them). These two incidents are separate, for the news reached the people of Madinah during the 'Asr prayer, and it reached the people of Quba, who were outside Madinah, during the Fajr prayer.