Habit of plant is different between the two. The petal shape is different and in particular, the color of the stamen. Grace tends to have coral pink anthers and pollen where Sharon's Delight's are yellow. Grace's petals are more pointed; Sharon's are blunt to scalloped, forming a more rounded flower as opposed to Grace's more star shape. Grace forms a denser bush; Sharon's is more open, formed from longer canes with clusters of flowers at their ends.