Vedra-
Gold Dusk and Spring Up are similar.... but I love Gold Dusk much more!
Gold Dusk is more highly reflective, brighter, more stand out than Spring Up. Spring Up is a frost, but is more muted than the G.D. pigment. It looks powdery in comparison. I love Spring Up as a nice neutral brow bone color. I use Gold Dusk everywhere! If you don't have either of these yet I would try to find Gold Dusk before it's all gone! my counter "sold out" but miraculously had it again last week.