He was scanned and has her x-gene according to X-Men Legacy 259 so she is a mutant. One thing it is important to know about their powers is they don't personally have the power of a planet or star's electromagnetic field, but they can tap into those power sources and look at it this way Earth's EM field is like a pea shooter compared to that of the electomagnetic energy of a star. I felt the Iron Man vs Magneto fight did a good job talking about how Magneto's power works.
Anyway power wise Magneto and Lorna shouldn't be different (other then times like Genosha where one of their powers is messed up) given they both tap into external EM fields. The main difference is skill and he still has a few decades on her there. I think she closed the gap a couple decades in the 6 months Marvel time she was on Genosha, but there is still a difference there.
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