They do look very similar. Go to emaryllis.com to look at his photos. Orange Sovereign is an older orange from van Waveren, described as a true orange. Naranja is a more recent introduction of Pennings, described as a coral/ salmon color. Color is very subjective, what each person sees in his or her own blooms, and also what the photographs show. Color in a photograph is dependent on lighting, background, use of flash, age of the bloom, etc. This is why it is so difficult to ID many of these cultivars, they do look so similar. Just think of all the Reds currently on the market