Entering new product key and automatic renewal

Hi, I've bought a Norton Security 1 year subscription card, unfortunately they didn't have standard Norton Security available which I have currently, but something called Norton Security Deluxe. I'm guessing its like standard Norton security but with added features. But is it classed as a different product? In other words, can I enter the product key into my existing standard Norton Security as usual, or do I have to uninstall and start from scratch?

Also I have just noticed something new this year, it says I have to enroll for automatic renewal. Does this mean I have to sign up for direct debit or enter a debit card number when installing?

Thanks