ive heard that companys have different sized skis, but they say they are the same length. for example, a k2 ski would be lets say a 179, and a rossignol ski would be a 179, but one brand would be longer or shorter than the other.
Quick example of the K2 Hell Bent, The 179 is actually 184, I THINK, its acutally 179 is on the snow at all times but if you add the rocker into it thats where you come up with the 184