Green: Mainly for reddish skin.

Crystal white: mainly for dark skin.

Ivory white: mainly for uneven and spotted skin.

Purple: mainly for dark yellow skin.

Pink: Mainly aimed at fair skin, making the face more ruddy.

The isolation effect is the same, depending on what color MM is. It's quite useful. I use purple, and my face looks more even and shiny.

Answer MM's supplementary question: 08 and 09 just changed the packaging, and nothing else has changed.