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Different part numbers, nearly identical specs.
MB053LL/A:
Works with iPhone, Apple TV and more
AirPort Extreme works flawlessly with iPhone and Apple TV.

It's compatible with 802.11a/b/g Wi-Fi wireless clients. And because it's dual-band, you can set it up to work on either the 2.4GHz or 5GHz band, reducing the chance of radio interference. The AirPort Extreme Base Station is Wi-Fi Certified for 802.11n draft 2.0.
MB053C/A:
Works with Apple TV and more
AirPort Extreme works flawlessly with Apple TV to transfer your media from iTunes on your computer to your TV.

It's compatible with 802.11a/b/g wireless clients. And because it's dual-band, you can set it up to work on either the 2.4GHz or 5GHz spectrum, reducing the chance of radio interference.
It appears iPhone and iTunes support is the difference.
 

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