Drone Flying in Croatia

Hi,
I have read the other thread about flying in Croatia but am still a little confused. I have got as far as getting an operator number which I will put on my Drone before I go to Croatia in June of this year. Do I also need a Flyer ID and if so how do I get that? I am going to complete the A2 CofC exam before I go. Will this provide me with the same rules in Croatia as it will in the UK?

Thanks in advance.

Jerry