MAC Earthshine is a moderately warm-toned, very dark brown with a frost finish. It is a limited edition blush that retails for $34.00 and contains 0.35 oz.
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MAC Earthshine Mineralize Skinfinish ($29.00 for 0.24 oz.) is described as a "tarnished bronze with gold pearl and pink reflects." It's a red-toned brown with burgundy and gold shimmer. The powder is composed of a dirty gold, peach-orange, and burgundy. I don't have Metal Rock, but it might be similar to this (so check your own stash!)--from what I can recall, Metal Rock is browner. MAC Warm Blend has a similar-colored strip in the middle, though it's not as red-toned. MAC Pressed Amber is much lighter and browner, less red-toned.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
Looking for something similar or to see what you have in your stash? Here are some of the top dupes for this product!
A luxurious, slow-baked, velvety soft, domed face powder with a radiant finish. Strategically buff on to add highlights to the high points of the face, or blend all over for a sheer luminous polish to the skin. Features M·A·C's 77-Mineral Complex and vitamin E.