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Could anybody help me to find out if the logic board on the Ipad mini Retina 2nd generation is the same as the one found used in the non-retina version? Thanks

The short answer is: No. They do have interchangeable parts such as the digitizer, and the antenna, etc. BUT, the lay-out for the two boards is different, and the more expensive things like LCDs and batteries are not interchangeable.