For Apple's mobile devices (iPod, iPhone, iPad):
Does Apple allow hardware differences among models of a single device family?
e.g. Do all iPad 3's have the same technical specs or is the Verizon iPad 3 technically different aside from the addition of LTE?
If there's any documentation on this (teardowns?) it'd be helpful for medical regulatory purposes so we don't need to buy 3 of each iPad/iPhone :)
For Samsung, individual carriers are allowed to customize each model of the S-whatever or Note whatever.
This leads to severe differences with components like the phone's mic sensitivity across the same device family. (eg. S3)
I want to know if Apple devices are susceptible to this kind of hardware fragmentation, or if Apple limits that.