The Dussi that I took pictures of is own-root and young. Although my picture is messy, I can see it has a distinctive foliage among other roses I grow, which I do not recognize in the photos of Prosperity...

I might have commented too quickly. The own-root Dussi I grow first showed its new leaves with a kind of teardrop shape (is there a name for that ?) but now they are larger and looking more usual so I went back to the Prosperity pictures for further examination. I could actually see the teardrop shape on carmenbcdc's photo, with the tip of the leaves wider and rounder. Also there is a yellowish green hue at the base of the petals, combined with a blushing center when the bloom is opening that I completely recognize. Frenchtearose site says it was introduced by Mr Branchi in 1998.