Some time ago I found this pretty little multichrome, W7 - Metallic Mars. Lulled away by the beautiful colours I could see in the bottle, I took it to the counter straight away and failed to notice how similar it is to Nubar - Iris Dust. My dislike of having similar colours was not as fast as my 'pretty colours-must have' impulse, which was also assisted by the minimal price of £2. All that is of course to your benefit since I get to do this comparison so you don't have to be fall into the same trap I did. I added Moon Eclipse (former Moon Shadow) in the comparison just for reference.
Open the pictures as a new tab if you want a closer look, all the pictures are taken under natural light. Let the madness begin!
Nubar Moon Eclipse is different enough, so I am going to focus on the other two. Consistency-wise Metallic Mars requires 3 layers while Iris Dust 4-5 for full opacity. Both colours have the same type of tiny shimmer particles I spoke about here, however, W7 Metallic Mars'base is a warmer tone than Nubar Iris Dust. When they are showing the pinkish colour, Iris Dust looks a tiny bit cooler than MM and when they are showing the golden colour, Metallic Mars looks bronzier. Frankly, even side by side you can see the differences are minimal, they are close enough to be considered dupes and I don't think you need both.
Have a nice day!