Just pulled out my DS pair of purple punches from 2018. This new foam is significantly softer than the 2018 foam. Definitely a different compound. I don't own any OGs so I can't comment of which is truer to the original.
This is the first time nike has ever retroed the huarache with the original outsole. The foam is also softer than the 2018 retro. It is evident that Nike has used a different mold and a different foam for these retros. The final of the 5 pictures is an image of the 1992 outsole.