What's the difference between a Hermès Birkin and a Hermès Kelly Bag?

Can you tell the difference between Hermès Birkin and Kelly bags?
I thought about this a few years ago one night while I was watching a repeat episode of "Sex And the City"  seeing Samatha’s bag, and then realizing that I wasn’t sure which one it was.

Coco Chanel Quotes

Gabrielle Bonheur "Coco" Chanel (19 August 1883 – 10 January 1971) was a pioneering French fashion designer whose modernist philosophy, menswear-inspired fashions, and pursuit of expensive simplicity made her an important figure in 20th-century fashion. She was the founder of one of the most famous fashion brands, Chanel. Her extraordinary influence on fashion was such that she was the only person in the couturier field to be named on Time 100: The Most Important People of the Century

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• "You should be two things : classy and fabulous "
• “Fashion is made to become unfashionable.”
• “I never wanted to weigh more heavily on a man than a bird.”
• “Nature gives you the face you have at twenty; it is up to you to merit the face you have at fifty”
• “Elegance does not consist in putting on a new dress.”
• “I invented my life by taking for granted that everything I did not like would have an opposite, which I would like.”
• “There are people who have money and people who are rich.”
• “There is time for work, and time for love. That leaves no other time”
• “Luxury must be comfortable, otherwise it is not luxury.”
• “There goes a woman who knows all the things that can be taught and none of the things that cannot be taught”
• “I don't understand how a woman can leave the house without fixing herself up a little - if only out of politeness. And then, you never know, maybe that's the day she has a date with destiny. And it's best to be as pretty as possible for destiny.”
• “If a man talks bad about all women, it usually means he was burned by one woman”
• “A woman is closest to being naked when she is well dressed”
• “Elegance is not the prerogative of those who have just escaped from adolescence, but of those who have already taken possession of their future.”
• “A women who doesn't wear perfume has no future.”
• “"The best color in the whole world, is the one that looks good, on you!”
• “As long as you know men are like children, you know everything!"”
• “Success is often achieved by those who don't know that failure is inevitable.”
• “How many cares one loses when one decides not to be something but to be someone.”
• “Don't spend time beating on a wall, hoping to transform it into a door.”
• “Fashion is not something that exists in dresses only. Fashion is in the sky, in the street, fashion has to do with ideas, the way we live, what is happening.”
• “Fashion fades, only style remains the same.”
• “In order to be irreplaceable one must always be different.”
• “The most courageous act is still to think for yourself. Aloud.”