Hii

Both the NDA-1 exam and NDA-2 have no difference. Just because the dates for the two are different i.e NDA is conducted twice so its named as NDA1 and NDA 2 respectively

For Nda1

Notification release in January and written exam held in April and results in June.After results they call us for SSB interview in August to October and overall final merit list is published in december.

For NDA 2

Notification release in June and written exam held in September and  results are declared in december. After written results they call us for SSB interview in January to March and overall final merit list is published in june.

So basically both are same with two different question papers and different exam dates. Rest the syllabus and pattern is same.

Thanks!!!