Windows 10: I Lost Windows product key when I'm switching from HDD to SSD can I pirate it?

I Lost Windows product key when I'm switching from HDD to SSD the thing is before I move to SSD I use the version of windows that is genuine since the windows is already installed on the device before I get my laptop so can I pirate the windows?

:)

 

Downgrading from a pirated Windows OS

You've already mangled your existing operating system by upgrading to a pirated version of Windows 10. Use your Windows 8.1 disk to do a new installation of your original Windows 8.1 operating system. If you have saved the product key from your original Windows 8.1 operating system, then use that product key again to install Windows 8.1.

You can downgrade from Windows 10 to Windows 8, by following the instructions in the answers to this question: How can I downgrade from Windows 10 to Windows 8?. Why not downgrade the pirated Windows 10 to Windows 8 instead and then change the product key and upgrade legally back to Windows 10? There are two reasons for not doing it this way:

1. Your new Windows 10 can inherit problems from the pirated version of Windows 10.
   
2. It's a two-step process to install Windows 8.1 and upgrade to Windows 10 instead of a four-step cumulative history: Windows 8.1 -> pirated Windows 10 -> downgrade pirated Windows 10 to Windows 8.1 -> upgrade to Windows 10. Even though the two-step method doesn't save any time, it still eliminates two unnecessary steps.
   

 

OEM Product Key On Pirated Windows

Am I able to use an OEM product key on pirated windows and older windows? (below windows 10)

 

Reuse Windows 10 product key on a new SSD

Hi, I have a HDD with windows 10 home installed on and I just got my new Samsung 960 PRO M.2 SSD. I want to use my new m.2 SSD as the bootable drive, but can I reuse the windows 10 product key on a new hard drive after already using it on another hard
drive? Thank you for all your support!