Privilege Escalation: priority of /etc/shadow and /etc/passwd

/#making a password

openssl passwd password (1oCs2Y6GOzDm2)2020/04/28/203446

openssl passwd pass (mV.TZP57qoG6s)

source: Editing /etc/passwd File for Privilege Escalation

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#changing /etc/passwd   root:password

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#/etc/shadow    root with no login (default)

#trying to log in to root with password: success

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#changing /etc/shadow    root:pass

Conclusion: /etc/passwd > /etc/shadow