DS-7608NI-K2/8P is an improved version of DS-7608NI-E2/8P/A with various improvements.
Read much more about that - and everything else - on the product page for the new version: DS-7608NI-K2/8P
We have kept the product page for DS-7608NI-E2/8P/A so you always have easy access to the documentation.