Do you maybe mean WHITE? Cuz yeah, it's a LOT different from Yellow, by about 4 generations...
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Different Pokemon evolve at different levels
Caterpie can evolve into metapod starting at level 7. The evolution conditions for caterpie are not different in Pokemon Yellow from other pokemon games.
Some Pokemon have different sprites due to their gender e.g. a female Pikachu has a heart tail whilst a male one has a straight edged one, this black Hippowdon is like this as it is female, the yellow Hippowdon you are referring to is a male.
these different color Pokemon are called shiny Pokemon, each Pokemon has a double that has a different color, like the "yellow magikarp", if you want one, use the old rod over and over again until you have a shiny magikarp.
Different games have slightly different results and characteristics.