Few noob questions... topic

Wife broke my phone so I ordered a "broken" one off Ebay... New one is fine not at all broken... I was going to just swap screens out to keep my unlocked bootloader but the new one is on ics... So noob question 1 will motopocalypse work on 4.0.4 or should I RSD /ota up to .66 or .1? I would like to have an unlocked logic board in case I brick... Noob question 2 once the device is unlocked can I restore a TWRP backup from device "A" to device "B"? As always I thank you kindly for your time and reply...

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