#304 is a shimmery, chartreuse-y green. It’s very much like #171, and at the time of purchase, I was a bit frazzled and quick in scribbling down the shades I wanted, but if I had been thinking, I would have skipped this one (or skipped the 171). They’re both incredibly similar. I’d say this one runs a little more green than the other, maybe. This one has a little more shimmer, and it is a smooth, well-pigmented shimmer shadow to boot. It does remind me of MAC Overgrown eyeshadow.