I'm looking to compare the Fourier Transforms generated by accelerators and gyroscopes that collected data of people walking. I've looked to see if there is a standard form of comparison, but I have yet to find one.
Here's my specific use case: I'm looking to compare similarity between the dominant signals of two Fourier Transforms (i.e. how close are they to being the same frequency/magnitude). Is there a specific metric that would help identify that?
If not (or perhaps irrespective of my goal), what are some common ways of comparing two Fourier transforms? I've found surprisingly little on the subject.