It may be easier if you compensate (flatten) the graph, as comparing curved lines is inherently harder. You can do this by pressing the little squiggle line next to the target on squig.link

You'll notice that once flattened, the S12 has more emphasis in the treble than the Zero.

One thing to note with these IEM graphs is the 8khz peak is a resonance from the coupler itself, and the following dip and secondary peak are also due to the coupler, so the treble above 8khz on these graphs are not always representative of what your hear in your own ear