Each zebra has different patterns and some are much thicker and bolder as in the equatorial Grant's and Boehm's zebra. Burchell's zebra do not have stripes on their lower legs or belly. So as with human's each zebra is unique. Just as humans are all very much the same, yet very much different, we think zebras are that way too. Humans have two eyes, but their color can be different.
Humans have hair, but the color differs.
Even our skin is different, yet has much the same purpose and function. So zebras, although you might think they look all the same, we think their striping is different from zebra to zebra. Each individual zebra has its own pattern and design. Mother and baby zebras can find each other by thier stripes, and when the whole herd runs, the stripes confuse predators. No two stripes are alike on a zebra, and no zebra has the same stripe pattern as another.