I retain the name for two reasons, neither particularly good, but there you go.
First, 'Double Bronze' is a really stinky name for a beautiful and ancient plant. However witless we may be as a generation of gardeners, we must surely be able to do better than that!
Second, this plant seems to me to be fuller in the flowers, larger and brighter than my plant of 'Double Bronze'. This form is being distributed by FarPlants, and for a number of years now I have been impressed by the way they distribute not just the best plants, but also seek out the best forms of the best plants. (No, we're not connected!)