Hello student

You can get the detailed information about this super common query among aspirants on this page:- https://news.careers360.com/neet-2020-number-of-registrations-increased-1594-lakhs-candidates-registered-for-medical-entrance-exam

But the main answer to this question is that due to covid and floods and some other reasons only 90% of the candidates were able to appear for the neet 2020 exam which is still a higher number as compared to only 75% of the candiadtes who appeared in the jee exam of september shift.

And Second part of the question is that (Yes) NEET is slightly easier than as compared to aipmt in terms of difficulty only but the competion is increasing day by day due to more no. of  students started applying and increasing cutoffs but the paper is shifting more towards NCERT in biology and chemistry and towards Mordern physics in physics which is making it easy but earlier focus was more on mechancics which has starting loosing grades nowadays.

If you require any more information feel free.

Thank you