I want to know that 2-years B.Ed course has now become 4-years integrated course. But after M.Com, will it be same 2-years B.Ed course?

Yes, definitely after M.Com if you want to pursue B.Ed then it will be of two years. Also B.Ed is a two year training course but some university, college and institute has integrated programme for this course. Like. Regional institute of Education, Central university of south Bihar.