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is it possible to sync iCloud Key Chain passwords on Mac with iCloud Key Chain on PC?

I have iCloud KeyChain Passwords installed on my PC desktop and also on my MAC Book Aire. But if I change or add a password (via KeyChain) on my PC, it doesn't also change on my MACbook KeyChain passwords.

PC KeyChain has a different password (to open) from my MACbook. Is that maybe the reason?