Can I give different email from that of JEE registered email for sign up in iit?

Hello Aspirant , hope you are doing good.

So , to answer your question, I would say you should definitely use the same email ID as you used in the JEE Mains examination registration  , and not use any other email ID , because it may cause some unnecessary trouble while registering for JEE advance , and even if it gets registered, it might cause problems later on while counseling as well. So it's better to go for the same email address.

Hope this helps you. Good Luck !!