The 1973 doesn't model the harmonic distortion at all. Testing Stillwell's 1973 against T=Racks EQ 73 gave very different results: the HF and LF shelving curves very radically different, the mid filter in Wide mode was similar (within a couple of dB). So I think that it's reasonable to assume that Waves and T-Racks are pretty faithful to the hardware given that they match each other.
I sadly don't own the original hardware so establishing a baseline for accuracy is difficult, but comparing Waves API 550's against T-Racks API's I found the EQ curves matched exactly, also as I've mentioned in another thread this also matches TDR/VOS slick EQ in American mode. I didn't measure time domain differences. I did a bit of testing on various EQs whilst deciding want to get in the Black Friday sales, I compared the filter shapes at various degrees of cut and boost, and the harmonic distortion.
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