Windows Update Registry Keys

Hi All,

I wish to control windows update by changing registry keys.
I wonder what is the difference between:
HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\
and
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto
Update\

if I want to initiate a scan using windows Update or WSUS, where
should I touch ?

Thanks

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