Hello Divya,
There is no difference between the state and the central EWS certificate. The EWS certificate is made one and is updated every year as it is based on the financial year. There is only one EWS certificate. If you fullfill all the criteria you are eligible to get EWS certificate.
Your State issued EWS Category is valid across India . So if you have EWS reservation and a Certificate, you can claim EWS reservation at both Central and State level Counsellings.
So, you need not to worry about that. You can avail all the benefits of EWS candidate, if you qualify for this.
I hope that this will help.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile