MAC Silly is a moderately cool-toned, medium pink with a matte finish. It is a limited edition eyeshadow that retails for $17.00 and contains 0.05 oz.
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MAC Silly Eyeshadow ($15.00 for 0.05 oz.) is described as a "clean blue pink [with a frost finish]." It's a light-medium pink with blue undertones and a mostly matte finish (there is no frost in sight). MAC Dynamic Duo #4 is a bit lighter (and so much sheerer/drier that they're not easy to compare). Guerlain Boulevard du Montparnasse #3 is similar in color but frosted. MAC for Miss Piggy looks rather similar in the pan (but it had poorer quality, so they don't look as much alike swatched). MAC Feather Pink is slightly lighter and has a satiny finish.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
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M·A·C Eyeshadow is a highly pigmented powder formula that applies evenly and blends well. Suitable for use either wet or dry, it's available in a wide variety of textures and finishes.