I already have Premium Subscription in Lightroom Mobile - How to upgrade to LR Classic Amazon deal?

I already have a LR mobile premium subscription with 100 GB cloud storage via the Google Playstore. I'd like to now buy this offer from Amazon.

It says it includes 1TB of cloud storage and the mobile app as well as LR and LR classic. Has anyone bought this before and how does it integrate with my already existing subscription (which I'd have to renew in january anyway for 48,99€). 

Can someone please help me or direct me to a support channel, where I can get this question answered, so I don't lose my data in the cloud when I add this new subscription or have to pay double.

Thanks!