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hi, i have a 21.5" imac 2012 is it possible to use the power and data cable from that for the 5k iMac as mine didn’t come with that cable and I’m not using the one in my 2012 model thanks?

The part is different. Why don’t you use the correct parts here. IFIXIT has it as well as others. 21.5" - 2.5" HD SATA Cable P/N: 923-0283Power Cable P/N: 923-0282 27" - 3.5" HD HD & Power Cable Assembly: 923-0312 Both cable sets are for the Late 2012 models. As far as I know the newer 5K Retina model uses the same cable. Which you can see here: 27" 5K Retina 3.5" drive Vs the 21.5" 2.5" drive.