Hull volume? Probably the infusion by a little bit - but the hull concepts are VERY different. If you are asking from the perspective of pitch-pole resistance, the Infusion is considerably more pitch pole resistant than any of the older, spherical bottom style, Nacras. The rocker location is different and the hull has more of a wide shape below the water line to better bridge the difference between two hull sailing and one hull sailing displacements.

I owned a Nacra 6.0NA for a while and have had an Infusion for several years.