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Both are the same size and dimension. There should be no problem.

The only difference with the iPad wifi and iPad 3G is that the 3G has a GPS chip and the black bar on the back where the 3G is.
 
What about the side? I think the 3G version right side will have the sim card access tray, the normal wifi version is completely flat. I ordered the Invisibleshield full set 3 days ago for my iPad 3G, but now I realize the small different between the 3G and Wifi design.
 
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