I think I found some decent dupes. For the matte soft coral I came up with MAC's Coral. I think this might be a bit brighter and a bit darker than the NARS version but it works well I think. I also used two Urban Decay colours which were Midnight 15 for the silver and Flow for the icy peach. Now these are not likely bang on dupes but I think you can see that the effect of Tiffany D's look is similar. The point is that there are probably a million dupes which would produce a similar look or effect. I think you could even use MAC's Paradisco for the soft matte peach if you don't mind using a shimmer instead.
In case any of you are wondering what on earth I am talking about, I have the link to Tiffany D's makeup tutorial below. I admit that Midnight 15 is probably the worst dupe I am mentioning here for the shimmery silver grey because it has some gold in it, but it seemed to go nicely with everything. I am sure any soft shimmery silver you have in your collection should suffice.
P.S. Don't mind my hair in the top picture. I don't think it looked that bizarre in person. It looks like I was trying some Carmen hairdo and I wasn't.