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Hi,I recently got a 60W MagSafe power supply with a broken cable. It came with few questions:1. Will it work correctly whether I change the cable to MagSafe2 and use it as an extra charger to my new Mac Book Pro 13'' with Retina? 2. Will there be any difference in charging time?3. Are they the same power supplies from the point of view of electronics? I think that I can do so since an adapter from MagSafe to MagSafe2 does not probably contains any electronics, does it?Thank you in advance for all answers!