Is cuDNN v7 backward compatible with cuDNN v5.1

Hi Folks,

I would like to upgrade my CUDA environment with cuDNN v7 (x86_64).
I found in the download area the tgz build for cuda80.

I was wondering if cuDNN v7 installed inplace of cuDNN v5.1
could break already existing application written for cuDNN v5.1.

In case a concurrent installation of both versions is doable (and recommended)?