All of thoose are different. Computer science, computer engineering, software angineering and informatics are all different conceptually
Accordingly, universities in continental Europe usually translate “informatics” as computer science, or sometimes information and computer science, although technical universities may translate it as computer science & engineering.
informatics is synonymous with computer science and computing as a profession,[3] in which the central notion is transformation of information.
^From the same link. Central notion is transformation of information
Now,
Computer science is the study of computation, information, and automation.[1][2][3] Computer science spans theoretical disciplines (such as algorithms, theory of computation, and information theory) to applied disciplines (including the design and implementation of hardware and software).[4][5][6]
Also
Software engineering is an engineering approach to software development.[1][2][3] A practitioner, a software engineer, applies the engineering design process to develop software.
