In the past, if you wanted to keep identical address books in two (or more) different Google accounts, the process was tedious and risky. You’d have to export your contacts from one, import them into another, and hope that nothing gets lost in the process. With this old process, as soon as any change happens in either of those accounts, you would be out of sync once again.
Now with Contacts+ Premium, keeping your contacts in sync across multiple Google accounts is super simple. Just go Contacts+ for Web, click Sync Sources -> Add sync Source -> Choose 'Google', and proceed.
You can have identical address books across as many as five Google accounts with a Premium subscription.
How can I adjust my sync settings?
Once you have your accounts added, you can choose how you want your connected accounts to behave. In order to create identical contact listings across your multiple accounts, you’ll want to turn sync toggle 'ON' for all of your connected Google accounts.
With that done, you're all set. No exporting, importing, or continual updating when something changes! Contacts+ is going to handle all of that tedious work for you. When a change happens to a contact in one address book, it will automatically sync to your other linked address books via the power of Contacts+'s syncing capabilities.