SAP SYSTEM SET UP FOR FIORI

Hello Experts,

I have an server with ECC 6.0, ERP 6, N/W 7.02 (EHP 2 with N/W 7.0) on it. I'm planning to Install N/W 7.4 on a different server, And would connect these both.So that the entire set up would be an Central Hub.Will it be compatible as a Fiori set up?

I'm aware of SAP Central Hub system & Fiori Set up, but I'm little bit confused with the backend ECC with N/W 7.02. Hence I'm posting this.

In this case, As i'm installing a N/W 7.4 on a different server, will there be any licensing for this N/W 7.4 again?

Thank you,

Sri.