Is the S-92 rotorhead (and dynamics) substantially the same as the S-70/H-60? (In other words, given SansAnhedral's point, might the fuselage of the MH-xx be based on the '92 rather than the '70?)
The 92 rotor head is significantly different. The S70 series uses a spindle/sleeve retention, whereas the S92 uses a hub/yoke/cuff setup which yields a vastly different layout.