Dear candidate.......,

Well, Jee Advanced roll number and Jee Advanced registration number are quite both different from each other. The registration number is developed at the time of completion of your registration for Jee Advanced after qualifying JEE MAINS. But the roll number of Jee Advanced is printed on the admit card at the time of its issue. So these are quite different from each other.

Hope this helps you out .......

Best of luck:)