MAC Silver Sun is a neutral-toned, medium green with a metallic finish. It is a permanent eyeshadow that retails for $20.00 and contains 0.04 oz.
MAC Silver Sun Extra Dimension Eyeshadow ($20.00 for 0.04 oz.) is described as a "mid-tone dirty sea foam green." It's a muted, medium-dark green with warm undertones and a frosted, slightly metallic, finish. It had semi-sheer coverage that wore well for six hours dry. It had mostly opaque pigmentation when applied damp and wore well for eight hours. It seems exactly the same as the originally released version, but the swatch seemed to catch light as it appears less metallic--I double checked, though, and they are really the same. See comparison swatches / compare dupes side-by-side.
A liquid-powder Eye Shadow with prismatic reflections in ten shimmering tints. Impact ranges from sheer crystallized light to a highly polished metallic effect. Lasts up to 6 hours.