Keychain Passwords Migration

Greetings Larry,

Thanks for using the Apple Support Communities! We understand that you are looking to learn some information about iCloud Keychain. Let’s take a look and see what we can do. We're happy to help!

If you have iCloud Keychain turned on then signing just into your Apple ID without performing a data migration will move over your passwords. You can verify that your passwords are syncing on each device using iCloud Keychain by checking this resource that we were able to gather.

Set up iCloud Keychain

Specifically, "How to find passwords stored in iCloud Keychain"

"How to find saved passwords on your iPhone, iPad, or iPod touch

1. Tap Settings, then select Passwords & Accounts. 
2. Tap Website & App Passwords or App.
3. Use FaceID or Touch ID when prompted.
4. To see a password, tap a website.

You can also manually add or remove passwords from iCloud Keychain. To manually add a password, tap the add button , then enter the website and password information. To delete a password, tap Edit. Then select a website and tap Delete.

How to find saved passwords on your Mac

1. Open Safari. From the Safari menu, choose Preferences, then click Passwords.
2. Enter your user account password.
3. To see a password, select a website. 

You can also add or remove passwords from iCloud Keychain. To change a password, select a website, click Details, change the password, then click Done."

Have a great day!

As per this article https://support.apple.com/en-in/guide/keychain-access/kyca1121/mac

Note: You can’t copy passwords stored in your iCloud keychain. To transfer these keychain items to another computer, set up iCloud keychain on the other computer using your iCloud username and password.

Note : the system files differ with individual Mac , may be the versions are same and same models are used .