What is the difference between Apple MB110LB/B and Apple MB110Z/B keyboards

Source: apple.stackexchange.com --- Friday, October 10, 2014 I am looking for a QWERTY US layout Apple keyboard, on amazon I found several models and this made me confused. My current keyboard looks like this, I thinks this is the standard US QWERY layout, isn't it? Anyways, I am looking for this model. Is it MB110Z/B? ...

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