After swatching some shades from my Chanel Le Vernis collection, this is the verdict on dupes/similar colors:
- Emprise seems to be most similar to Pêche Nacrée, but Emprise is more opaque and pinkish on the skin while Pêche Nacrée is more pearly/peachy. I thought Emprise would resemble Django but it’s quite a bit darker and more peachy. Compared to Rose Satin, Emprise is similar but more opaque and peach. I thought Emprise would be most similar to Inattendu, but swatched side by side, Inattendu almost looks tan.
- Fracas is a warmer and more vibrant version of Rose Insolent. Compared to other pinks, Fracas makes May look pastel. Fracas has a hint of melon when compared to Dior Plaza, but Fracas is still clearly pink. On the nails on my skin, I feel it’s almost identical in finish to Rose Insolent.
- Accessoire is a lighter version of Rouge Noir. Compared to others, Accessoire is warmer/redder than Provocation (more purple/plum), more plum-red than Forbidden (most brown), and lighter and redder than Diabolic (the darkest one I have). On the nails, it’s hard to distinguish the difference between shades.
On the nail wheels: Tendresse, Pêche Nacrée, Emprise, Rose Satin, Inattendu, Morning Rose, May, Fracas, Rose Insolent, Dior Plaza, Accessoire, Provocation, Rouge Noir, Forbidden and Diabolic.
Some photos under artificial light, I hope this alternate view will give you a better idea of comparisons: