Hello student there's nothing different in both of this two exam you can appear in both and the best of two will consider as your final marks to calculate your all india rank.the only difference is of time you'll get more three month if you'll appear in April jee main exam.

I request you to plz visit the link mentioned below for each and every jee updates that'll help you
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-exam-dates/amp

Feel free to comment if you have any doubt
Good luck

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