The original on the left (MAC "Glamour Check!" from the Starflash Collection) and the drugstore dupe (Revlon Satin "Shimmering Sienna") look different in the packaging, but when swatched both are a silky bronze amber shadow with fine shimmer.
it's basically impossible to tell the different between the two (Revlon & MAC)
this color will be gorgeous for warm smokey looks during the fall and winter. with a nice bright highlight on the inner corner and a matte deeper chocolate brown on the crease and outer corner, this shimmery shade all over the lid would really pop. run a bit of the lid color along the lower lash line and you have a smokey look that can look day or night. the bright amber will make blue and green eyes stand out, and make darker eyes glow. gorgeous!