I'm sure someone would have posted something like this eventually. Even the much-maligned RMAA can tell us a story:
As far as I can tell, Dirac isn't doing things like crossfeed or adding delays or reverb. Crossfeed would have been nice, but IMO it's better not to mangle the signal like Aphex and BBE do.
The correction filters for the Earpods seem to be similar. Accudio is more conservative and it uses fewer bands of parametric EQ. They say that they try not to boost nulls caused by comb filtering and and that they don't try to cancel the sharp peaks caused by resonance. Those half-wavelength resonances that come with IEMs are usually dependent on things like tip selection and insertion depth, so the correction filters for those things are guesses, at best.
But when I played with the Earpods and a tone generator, I found the peak at 6 kHz to be largely unaffected by the looseness or tightness of the fit. The data on goldenears.net seems to support this. So the decision by Dirac to null the response at 6k works for me. But I'm only one data point. YMMV. The frequency response charts on goldenears.net use 1/3-octave averaging, so we see shorter and wider peaks than if they had reported the raw response. Accudio's filters seem to be correcting the averaged measurement.
The Earpods' frequency response at the low end really depends on how and where you have them positioned, and both Accudio and Dirac are making guesses on the kind of fit that you have. So the settings on both programs won't work for everyone.
The big difference I see on both graphs is the response at 3-4 kHz. Accudio wants it to be around 4 dB higher than Dirac. From what I can hear with music and tone generators, Accudio is more in agreement with any of several sets of of my speaker rigs, all of which measure flat at the listening position (before applying a so-called X-curve that rolls off the treble gently).
Here's what Accudio says it's doing (seems honest enough):
I suppose, if you really wanted to, you could try your best to copy Dirac's frequency response using Equalizer or custom mode in Accudio. The results might sound very, very similar.