From: Rabbi Moshe Sofer
To: Unknown recipient
The Chasam Sofer argues that the yakir requirement for nachalah—based on a father's recognition of familial resemblance—is fundamentally distinct from the identification standard required for eidus in agunah cases. He rules that halachah follows R' Yochanan over Reish Lakish, requiring the full padachas for bechor status, and that R' Tam's view on body identification is irrelevant to nachalah, where facial resemblance rather than individual identification is the operative principle.
Source: Shu"t Chasam Sofer EH I §54