Look at the people transmitting the Hadith about intentions from Yahya ibn Sa'id:
• In one chain: Sufyan transmitted it from Yahya ibn Sa'id. (Sahih al-Bukhari: 1)
• In another chain: Malik transmitted it from Yahya ibn Sa'id. (Sahih al-Bukhari: 54)
Yahya ibn Sa'id appears in both, but the person transmitting from him is Sufyan in one and Malik in the other.
These are only the relevant parts, not the complete chains.
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Ṭarīq and Ṭuruq: Chains of One Hadith
Look at the people transmitting the Hadith about intentions from Yahya ibn Sa'id:
• In one chain: Sufyan transmitted it from Yahya ibn Sa'id. (Sahih al-Bukhari: 1)
• In another chain: Malik transmitted it from Yahya ibn Sa'id. (Sahih al-Bukhari: 54)
Yahya ibn Sa'id appears in both, but the person transmitting from him is Sufyan in one and Malik in the other.
These are only the relevant parts, not the complete chains.