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Dual Boot from existing Windows (activated) drives

My development machine (Win7) recently died. I purchased a new Win10 machine and transplanted the C: drive from the Win7 machine to the new machine (as a 2nd hard drive). I now want to be able to dual-boot to either drive.

Most of the answers I’ve found involve new Windows installation(s) on one or both partitions. But I’ve already got two activated, bootable drives.

I have two questions:

  1. How can I set these up as a dual boot configuration?
  2. If I succeed, will I have a problem with “Authentic Windows” validation when I boot from the old Win7 drive?