The online application form for NATA will be released on third week of January. You will get the link for filling up the NATA form from the given link when it will be released.
http://engineering.careers360.com/articles/nata-application-form
Both the exams are almost same but the conducting body is different. And also the disparity lies in participating colleges in NATA and JEE Main Paper 2. JEE Main Paper 2 opens the doors to NITs and GFTIs offering B.Arch course whereas admission in colleges like SPA Delhi and CEPT University Ahmedabad is offered through NATA.
http://engineering.careers360.com/articles/nata-or-jee-main-paper-2-which-better-option-for-barch-admission

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