Hello,
No both are the different things.
Application no. Is the one which was created when you submitted the application and Roll number is printed on the admit card so as to sit in the examination centre in proper order.
Also, application number is required always to login into your account.
Good luck.

Hello Jag Mohan,
No, I think both are not same. Application no is required during log in and after login roll no is shown in your admit card.
Hope this would be helpful.
Good Luck!

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