At first glance, some of these lip colors look exactly the same. However, when swatched they turn out to be quite different. Here are a few of my similar MAC lipsticks with side by side swatches. I separated these in groups of three, for instance, three lighter nudes, three slightly darker nudes and finally, the last three vampy shades. All of these have matte finishes, with the exception of Lady Be Good, which is a liquid lipstick with a retro matte finish.

Honeylove and Lady Be Good appear to be identical, but on the lips Lady Be Good is a little closer to Taupe. Kinda Sexy is the peachier nude from this group. It's similar to Honeylove, but Honeylove is a lot lighter. Whirl is close to Taupe, but it has a mauve undertone, unlike the other that has a brown undertone.

Moving on to the lipsticks that inspired this post. When I bought Antique Velvet I didn't expect it to look so much like Sin. To be honest, I was quite afraid I had purchased an almost identical lip color. When you swatch both of them, you can actually see how unique they are. Sin is a beautiful burgundy and Antique Velvet is a true brown. Viva Glam III is not as deep as Sin, but it's in the same color range.

• Honeylove is described as a "light beige toned with rose".
• Lady Be Good is described as a "warm mid-tone nude".
• Kinda Sexy is described as a "neutral pinky-rose".
• Velvet Teddy is described as a "deep-tone beige".
• Whirl is described as a "dirty rose".
• Taupe is described as a "muted reddish-taupe brown".
• Viva Glam III is described as a "muted brownish-plum".
• Sin is described as a "deep dark blue red".
• Antique Velvet is described as an "intense brown".

By looking at these swatches I wouldn't say any of these are dupes. Sure, some of them are pretty similar, but they're definitely not identical or incredibly close. Do you know any MAC lipsticks that look alike?