I'm not an Italian nurse but I'm from the EU nevertheless. My degree was evaluated by the CGFNS and it was accepted as an equivalent to the American BSN.
For the CES you'll need to ask for your university to fill out a transcript validation form. On that form they've included a request for breakdown of coursework, divided into medical, surgical, maternal/infant, children, psychiatric/mental health, geriatric, community health, long term care, acute care and physical assessment as well as anatomy, microbiology, pharmacology, nutrition, chemistry and physics. The basic rule is you need 40 hours of theory and 80 hours of clinical in each area.
I noticed that with a BSN from the EU my hours far exceeded the minimum requirement, especially with clinicals, so I guess and hope that'll be the case for you as well.
Anyway, before you go ahead with ordering the CES, you could request your university break down these hours for you (or do it yourself). See if you can match the requirement in each nursing area and if you do, your degree should be fine.