MAC Duck is a very warm-toned, dark brown with a matte finish. It is a permanent eyeliner that retails for $16.00 and contains 0.04 oz.
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MAC Duck Powerpoint Eye Pencil ($15.00 for 0.04 oz.) is described as a "soft grey brown." It doesn't read gray at all to me; it's more of a warm-toned, medium-dark brown with hints of red in the base. It has no shimmer, so the finish tends to look more matte on the lash line. Chanel Brun-Teak is similar but darker. MAC Brownborder is also similar and only slightly darker.
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Waterproof. Longwearing. Metallic, shimmer and matte finishes. Smooth to apply. Won't transfer, smudge, or budge... Draws the line: powers your eyes. Makes its point. Lasts.