Apple 45W MagSafe Power Adaptor for MacBook Air

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There are two part numbers for the Apple 45W Mag Safe Power Adapter for MacBook Air MB283LL/A and MC747LL/A. What's the difference between the two?

Purchasing some extra power supplies for the MacBook Air's we just bought at work. Found two of the same thing with different part numbers. Is there a difference?

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    When I look on the Apple Store there is only one 45W charger available to purchase--MC747LL/A. The different 45W charger parts probably have some internal changes. I noticed the same question about 60W units about 2 yrs ago. Probably happens periodically as parts/suppliers change. Both are most likely comparable, but check the specs.

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