BTech in Computer Science & Engineering provides you a better and elaborative study in the field of Computer Science & Engineering. So the knowledge you have gained in your Diploma in Computer Engineering, will be a foundation but you will learn a much more detailed subjects in the BTech Computer Science & Engineering. If you have done the Diploma in Computer Engineering, as you know the basics of the things you will get quite a good opportunities to learn the skills and it won't be hard for you if you are interested in the subject and if you have studied well in your Diploma level course. So if you are interested you must go for the BTech program as it will provide you a better job opportunity.

After the Diploma in Computer Engineering, you can apply for the BTech Lateral entry in CSE course in which you will be provided admission directly on the admission to the 2nd year of BTech in CSE.

For more information regarding BTech in CSE consider the link below:

https://www.careers360.com/courses/b-tech-in-computer-science-and-engineering

I hope this helps. Wish you a great day!