They are the same. Is it correct...

CSM is so confusing that in some MB (like my GA Z170) there is no CSM. Compatible with what? To do what?
My MB has two options:
UEFI Windows (8 - 10) - Once selected it will set Secure boot, Fast...

In most computers, CSM is to boot as Legacy-MBR. If you want to install as UEFI-GPT, set CSM as disabled.

I don't know if Macrium recovery media and /or Linux live are digitally signed.
I myself don't use BIOS Secure boot and Fast Boot as Win 7 is incompatible with Secure boot.

To install Win 10 as UEFI-GPT all you have to do is to boot the Win 10 installation drive as UEFI, delete all partitions and then proceed.
To convert a MBR to GPT all you have to do is to delete...