Maybelline Opalescent Orchid (515) is a cool fuchsia with a pearl finish that is permanent and retails for $8.99. In comparison, MAC Viva Glam Miley Cyrus is a cool fuchsia with a sparkle finish that is limited edition and retails for $21.00.
MAC Viva Glam Miley Cyrus is 85% similar — it is more shimmery, lighter, more muted.