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The 7 pairs where both forms appeared in the top-10. These are the rows where the ranker had to choose between two valid alternatives.

Query | Swift rank | Obj-C rank
--- | --- | ---
URLRequest | 1 | 3
URLComponents | 1 | 2
Bundle | 1 | 2
Measurement | 1 | 8
DateComponents | 1 | 4
DateInterval | 1 | 6
Decimal | 1 | 7

In every case Swift is at rank 1, Obj-C at rank 2 or later. The minimum Obj-C rank is 2 (`URLComponents`, `Bundle`); the maximum is 8 (`Measurement`). The gap between the two is consistent across the corpus.

For the other 23 pairs the NS-prefixed form either does not exist as a separate documented page or ranks below position 10 (not measured here; the harness limits to top-10).