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I have a 15” 2012 MBP Retina Display with a broken screen. for cost saving reasons I wonder if I could use a standard hi res display assembly in place of a Retina Display assembly. is it possible?

No way, nothing matches at all.

Here is the correct part MacBook Pro 15" Retina (Mid 2012-Early 2013) Display Assembly and here’s the guide to put it in MacBook Pro 15" Retina Display Mid 2012 Display Assembly Replacement Between the physical and the signaling iDP (eDP) Vs the older LVDS differences you just can’t do it.