With all the new MAC collections coming out right now you can afford to waste money or time buying colors just like those that you already have. It happens to me all the time so I thought I would try to save someone else from making the same mistake:)
For reference, I am medium/tan skintone with olive undertones and wear NW25/30 in MAC foundation.
Here are the dupes I came up with for the new Neutral colored Gold/Bronze quad (Colour 4) from MAC’s Spring Colour Forecast Collection:
MANILA PAPER (Veluxe Pearl) – This is a gorgeous, super pigmented, bright highlighter. I have TONS of highlighters and surprisingly I didn’t have too many that were exact dupes for Manila Paper. Shore Leave is pretty close, but a little pinker than Manila Paper. There was a color in the Lace 6 Warm Eyes Palette called White Tie that is similar to Manila Paper but lacks the shimmer and frostiness. It is just a muted version of Manila Paper. Vanilla Pigment could also be used in place of Manila Paper.
Here are the some of my highlighters I swatched with Manila Paper:

TOP: Manila Paper, Magic Dust, Rite Of Spring, Blanc Type, Shroom, Femme-Fi, Naked Lunch, Shore Leave, Grand Entrance. BOTTOM: Mylar, White Tie, Bold As Gold, Oh My Darling, Chillproof, Vanilla Pigment, Universal Mix.
FLIP (Frost): Blonde’s Gold Pigment is a great, slightly more metallic, dupe for Flip eyeshadow.
AZTEC BRICK (Veluxe Pearl) – Aztec Brick is a gorgeous eyeshadow but pretty dupeable. I found dupes in Valet (from the Lace Warm Eye palette), Rich Symbol (from the Warm Eye Patternmaker palette), and Rushmetal pigment. Although Rushmetal is a little less red, and more gold/bronze than Aztec Brick.
CREOLE BEAUTY (Frost) – I didn’t find any exact dupes for Creole Beauty, but Woodwinked was similar. Here are the other colors I swatched with it.

Cocomotion, TOP: Creole Beauty, Romp, Mulch, Time & Space, Buckwheat. BOTTOM: All That Gliters, Wood winked, Devilishly Dark, Mega Rich.
So, here is a summary of the Neutral Quad (Colour 4) dupes:
Manila Paper = Shore Leave or White Tie
Flip = Blonde’s Gold
Aztec Brick = Valet or Rich Symbol or Rushmetal pigment
Creole Beauty = no exact dupes, but Woodwinked could be used.
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