MAC Freshen Up is a moderately warm-toned, very light orange with a pearl finish. It is a limited edition blush that retails for $35.50 and contains 0.35 oz.
MAC Freshen Up High-Light Powder ($35.50 for TBA oz.) is described as a "color wave ranging from coral to neutral." Mixed together, it's a lightly brightened, peachy tangerine with warm, reddish-orange tones and a very, very fine shimmer-sheen finish. (Keep in mind, most of the gold sheen on the surface is an over-spray, which I removed prior to swatching!) Urban Decay Kinky (P, $26.00) is darker. Urban Decay Indecent (P, $26.00) is peachier. Laura Mercier Rosegold Shimmer (LE) is more shimmery, darker. Too Faced Luminous Peach (LE) is more shimmery. Chanel Caresse (180) (LE, $45.00) is less orange. YSL Rebelle (7) (P, $47.00) is darker. MAC Style Cast (LE, $21.00) is more shimmery. Makeup Geek Smitten (P, $9.99) is lighter, less shimmery. Surratt Beauty Cantaloup (P, $32.00) is brighter, yellower. Guerlain Orange Blush (LE) is darker, less shimmery. Dior Amber (002) (LE, $56.00) is lighter. MAC Fresh Honey (LE, $27.00) is darker. MAC Blazing Haute (LE, $25.00) is more shimmery. MAC Ripe Peach (LE, $32.00) is darker. See comparison swatches / compare dupes side-by-side.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.