That's right, but the test we use is "are two articles different enough to support a substantively different discussion". In this case the answer is clearly no, so they fall in the same equivalence class.
We do that all the time, of course—just not enough to satisfy those who would like (a lot) more. But we have the rest of the community to think about as well.
That's a statement from the PSF.
This is a personal blog post of one of its board members.