Just purchased a used 2017 4K 21.5 iMac. I'm wanting to upgrade the 1TB fusion drive and 8gb ram. I heard i can upgrade the memoryas well (which I believe is a nvme ssd). My question is: can i use a 128gb nvme from my 2015 MacBook pro OR is that not compatible, thus needing to buy a separate ssd? Let me know, thanks