Yes. If your password manager supports passkey synchronization (e.g., iCloud Keychain/Passwords for Apple devices or Google Password Manager for Android devices), your passkeys can be securely synced across multiple devices.
Example:
Device A and B: Install Kaia
Device A: Set up a passkey for Kaia
Device B: Log in to Kaia — a QR code will appear
Device A: Scan the QR code from Device B