anyone tell how much difference in preparation for nclex and crne?

hello everyone
i m mini i have done bsc nursing and applied for regestration in alberta,canada.
finding how to prepare for crne exam?as in my area there is no coaching centre which provides coaching for crne,so i thought i will attend classes which are given for nclex,so want to know are both exams are different?
will it be useful to me if i attened nclex classes n give crne or both are totally different???????????
plzzzzzzzz help