The description for this rose includes the statement, "'Impératrice Joséphine' is strongly fragrant and semi-double to double, while 'R. francofurtana' is slightly fragrant and single to semi-double." This statement is repeated in the description for Empress Josephine.

Some of the references seem to say the opposite, such as The Graham Stuart Thomas Rose Book, "Fragrance is rather lacking in 'Empress Josephine', but in the form 'Agatha' it is as delicious and strong as any." Beales' Classic Roses says of Agatha, "Flowers slightly smaller and of a deeper pink shade than those of the 'Empress' and with a stronger scent."

I'm thinking these were accidentally reversed on the description pages.