Not a whole lot but alligators have a bigger and wider snout and theres a particular thing about tooth arrangment but the only real difference is geography. We have gators in the states they have crocs every where else.
There are also species of croc that are significantly larger than your largest alligator. Gators where i live can get up to 13ft. And thats huge here. But i have heard of saltwater and nile crocs reaching 20ft ON AVERAGE.
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