iTunes had a separate password to backup from personal computer

A couple years ago when I got a new iPhone, I was attempting to restore from iTunes on my personal computer, and I think the password to do that was different from my Apple ID password. I almost could not get all my pictures and data-- had to go through many old passwords to find the correct one, and it wasn't the same as my Apple ID password.

Now, I am having issues with unauthorized log-in attempts in another country, and want to change my Apple ID password, but want to confirm if there is a still a separate password to access the data in my iTunes backup on my pc within iTunes