Counting the many options of the iPad, with 18 in total (White/Black, WiFi/CDMA/GSM, 16GB/32GB/64GB) there are sure to be some design differences. Well iFixit has dismantled the base model iPad 2 for the WiFi and different 3G configurations of the iPad 2. Below are the 3 different logic boards with the WiFi at the top and the 3G models below the ruler.
The CDMA model for Verizon has an additional antenna as compared to the GSM, but actually incorporates a Qualcomm Gobi dual-mode radio which actually supports both CDMA and GSM. check out iFixit iPad 2 teardown for more details.
iFixit also did a teardown of the Apple Smart Cover for the iPad 2.
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