One of the similarities between the two is that they both feel free out there in the great outdoors. Huck has never known anything else in life; since he was knee-high to a grasshopper he's had to make his own way in the world, living off the land and sleeping under the stars. He'd never be able to adjust to life in a town or city, as his experiences with Miss Watson and the Widow Douglas show.
As a slave, Jim can never experience freedom in the so-called civilized world. The natural world provides him with a haven of relative peace and security, free from the horrors of forced labor and perpetual servitude. Like Huck, Jim can only truly be himself in a natural environment. This is the only place where either can express their individuality.
As regards to differences, Jim's freedom is danger of being taken away from him at any moment. He and Huck constantly need to be on the look-out for any bounty-hunter seeking to make a quick buck out of capturing a runaway slave. But it's Jim's...
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