In your settings you should be able to save your contacts on the Nexus 6 to a Gmail account or any account you're using. Then sign into your Google account on your 2013 Nexus 7 and all of your contacts should appear. You might have to go on to your Nexus 6 and go through each contact individually and make sure the contact is saved to your Google account before transferring them to your Nexus 7 tablet.

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