Your NSEC private key and HEX private key are the same private key. They are just in different formats. NSEC is easier to tell that it's different from NPUB right away. Whereas with the HEX version of public and private keys, you can't tell the difference.
Discussion
Isso… só tenho a HEX nessa conta mais antiga e não consigo fazer o login no link que enviou, como descubro minha NSEC só tendo a HEX? Ou extraio isso dela para ganhar meu presente 😁