I am in the diploma program and am thinking of pursuing the Master's degree. I got a Bachelor degree in computer science many years ago. I have been out of school since then. However, I had been working in the computer industry for many years. We would strongly suggest that you take a few senior undergraduate CS courses before you apply.
Computer science is a very fast changing field.
Contents of many computer science courses became obsolete after some time. The requirements are identical to the full-time program. Many courses are given in the evenings. It will take longer to finish the program on a part-time basis. It is possible to combine, to some extent, external and internal sources of support.