This is a very relevant problem for majority of the engineering school graduates in Sweden. Based on the Bologna Process all MSc level programs are essentially cut into two bits; one that roughly corresponds to a Bachelor's (approx 3 years) and one that corresponds to Master's (approx 2 years). So far so good, the issue is that you get 1 diploma and you are supposed to have 1 title however there are numerous ways you can do your 3+2.
What they have done to amend that is to formulate it as:
M.Sc. in Engineering X with specialization in Y
which could be something you do in your CV as well.
PS: I have the same issue even for my PhD, my group is part of a department that has a much different focus compared to what I do. So much so that there is pretty much zero overlap between my departmental association and my day-to-day research.
Even there the I will be getting a PhD title with a description along the lines of:
PhD in [dept_name] on Bioinformatics and Systems Biology
Of course one would and should write more about the actual work regarding the PhD, like the thesis title, and a short description of what it's about.
It really is a clumpy way to describe what you "are" and what you have "done" but it's getting harder and harder to define and classify research as fields start merging into one another.