question #1 Sahih Muslim 1211s, Book 15, Hadith 137 : What challenges might arise in differentiating between narrations from different sources?

I cannot differentiate the hadith of one from the other (Qasim and Ibrahim) that the Mother of the Believers (Allah be pleased with her) said this: Messenger of Allah, people have come back with two acts of worship. The rest of the hadith is the same.