Hey Vikas,

See its all about the point of views. CSE has a broad field of view and Software Engineering is getting narrower or a branch of CSE. Software engineering and CSE have similar syllabus till the 2nd year. After that the syllabus and the curriculum will change, there will be a deviation both in curriculum and teaching methodology. Software Engineer deals with Software development fields like testing, metrics development. While Computer Science Engineers deals with AI, a series of programming language. For instance, Data Base Management System (DBMS) is taught to the branches in the 6th semester but the teaching methods are different. SWE has very fewer opportunities for projects. 

And if you are willing to do Mobile App Development then go for CSE because you will get to learn a lot of programming languages in these four years of course.

All The Best

There is nothing like bachelor in software. You have to take any course to study Android. It doesn't depends from which course you belong from. Even a mechanical engineer can read Android and make mobile apps. The advantage for a CSE or IT students is they can get the concept easily as they know about it prior to the course. That's it. There is no difference. You can take any btech course to read Android.
Hope it helps!