An easier example: did you ever know any identical twins? Identical twins are natural clones - they are exact genetic copies of each other. They don't necessarily look identical though. There are subtle differences in fingerprints, freckles, moles, shapes of their noses, that sort of thing.
Calico cats have one of the most complicated coat patterns known. It isn't clearly understood yet exactly how the different patches of color are determinied, but it is known that there is a lot of "luck of the draw" involved that helps determine what each section of the calico's body ends up colored as. Each cell has the chance of being orange, black, or white. What color it actually turns out to be depends on what cells next to them decide to do, what temperature that part of the body is at the time the critical decision is being made, and just plain chance. If there are other kittens in the womb, the conditions are totally different than if there is just one kitten in the litter. So, as you observed, the patterns of the kitten-clone look different than it's mother-clone's coat patterns. They really are clones though.