Amud 95b

תוס' ד"ה איבעית

If you want I will say as רבה בר אבוה switched - איבעית אימא כדמחליף רבה בר אבוה

Summary:
What is gained by establishing the ברייתא like ר"י, since it will turn out that it is שלא כהלכתא?

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תוס' ד"ה הא

Since the סיפא is on top of her, the רישא is by different work - הא מדסיפא על גבה רישא במלאכה אחרת

Summary:
We can more readily distinguish between major factual differences, as opposed to minor factual differences (even if להלכה they are equivalent).

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