JEE Mains PAPER 2 and NATA both are conducted for admission into 5 years Architecture Courses. There are though differences in both the exams which are as follows :-

• JEE is conducted by NTA(National Testing Agency) whereas NATA is conducted by Council Of Architecture. 
• The institutes that give admission on the basis of JEE Main Paper 2 are NITs and GFTIs whereas by NATA you get admission in private colleges and state level colleges except NITs, GFTIs.

If you still have any queries feel free to ask in the comment section down below. 

Hi srikanth,

JEE Mains:

• Exam conducted by CBSE Board,
• Admission to IITs ,NITs and Centrally Funded Institutes.

NATA :

• conducted by National Institute of Advanced studies in Architecture(NIASA)
• you can get admissions to all the B.Arch colleges except IITs,NITs

It is better if you prepare and apply for both the exams. Based on the score you get ,you can select the best college.

Hope this helps you.

Good Luck!!