How to find out my old password without having the same iPhone
This is a new iPhone and need that old password to that phone but I forgot it
Question marked as
If you are asking about the passcode that unlocks there screen there is no way to recover it, but it also will not be the passcode for a new iPhone, as passcodes are created for a specific device.
If you mean your Apple ID password see this support document→If you forgot your Apple ID password - Apple Support
And if you mean the Screen Time passcode see→If you forgot your Screen Time passcode - Apple Support
