The windows 10 license follows the motherboard (it is digitally activated and activation status is retained on MS servers).  It doesn't follow the hard drive.  That being said it should still boot fine and work (you can, after all, install windows 10 without entering a key during installation) if you transfer it over, you will just likely lose activation status as soon as the hardware change registers. 
Hello everyone, so I am thinking of migrating parts from my aurora r8 including my: i7-9700k, RTX 2080, 256GB m.2 SSD (for OS and some games for quick load times), and the 1TB 7200rpm HDD from my aurora to a new NZXT h510i case with an MSI MPG Z390 Gaming Pro Carbon. Will there be any issues booting with this setup? Like the windows watermark? or Difficulty booting without alienware hardware in place? Thank you.
Aurora R8, part migration to different case