Graviman,
The UH-60MU FBW effort was actually initiated prior to X2 (03), and has more in common with the S-92/CH-148 system. The X2/333 FBW system is a HW/HamStan effort, whereas the UH-60MU version (common with AH-64D Block III) is a BAE/HamStan system, presumably drawing on HEAT.
I/C