MAC Nude is a very warm-toned, dark taupe with a matte finish. It is a limited edition lipstick that retails for $20.00 and contains 0.1 oz.
MAC Nude Lipstick ($16.50 for 0.10 oz.) is described as a "cool nude cream [with a Matte finish]." It's a medium-dark brown with a gray cast--almost slightly rosy-toned at certain angles--and a matte finish. It had opaque color coverage, and it felt very creamy, even for a matte (which is different than a Retro Matte!). It lasted for five hours and was neither drying nor hydrating. MAC Shitaki is warmer, shimmery. MAC Double Shot is warmer, richer. Guerlain Giny is much lighter. Bobbi Brown Uber Nude is rosier. See comparison swatches. I think MAC's permanent range may have some similar shades to this, but I'm not familiar enough with some of the browner shades to say for sure, though.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
Formulated to shade, define and showcase the lips, M·A·C Lipstick is available in every nuance of your favorite color and high-fashion texture. It's the iconic product that made M·A·C famous. AMPLIFIED CREME (A): Ultra-creamy. Quietly shiny. Color-packed! Hi-res: hi-impact. CREMESHEEN (C): Creme-based lipstick that imparts bright full color, with a soft and supple shine. FROST (F): Excellent color payoff with medium to high frosted shimmer-and-shine finish. LUSTRE (L): Demi-sheer with wet-look lustre finish. Very slick. Makes lips look soft, smooth, ultra-moist. MATTE (M): Pigment rich with intense color pay-off. No-shine, all matte finish. SATIN (S): Color-rich. Soft satin, semi-matte finish. Conditions while adding intense color.