According to The Hostapedia by Mark Zilis (2009), "H. 'Silver Crown' = H. SILVER CROWN = 'Fortunei Albomarginata'"

After reading a bit more on this subject, I think I now understand it. When a cultivar name is in ALL CAPS, it is a commercial or tradename by which the plants have been traditionally sold at nurseries. In this case, the plants that have been sold as H. SILVER CROWN (or H. 'Silver Crown') were mislabeled and should have been labeled, H. 'Fortunei Albomarginata'. Hope that makes sense. It is still a remnant of the historical jumble of names in Hostadom.