Typically the lighter color your eyes are, the better colored contacts will work. The good news is that with theatrical colored contacts, such as pink, the difference should be very minimal to non-existence.
The reason is because theatrical pink contacts are designed to completely cover the natural color of your eye, as opposed to natural colored contacts like blue or green tint which usually just highlight or add a tone to your natural eye colors.
If you are buying pink colored contacts and you have dark colored eyes such as brown, or dark brown, then the darker pink you get the better, and as long as they are Plano contacts which cover the entire eyes natural color, you should get a perfect pink colored eye with no problems at all.
You might want to first ask the manufacturer or company you are buying the pink contacts from first, just to make sure they will work for you.