Insofar as logistics and parts commonality between the Seahawk and Blackhawk, things like Tail Rotor Gear box, drive shafts, the same. Engines, being T-700 variants, mostly the same, with a few subtle differences. Transmission on the new Seahawks have an additional appendage to run the hydraulic system powering the dipping rig. You won't find that on the Blackhawk transmission, M or L.
Don't believe the Navy went with Wide Chord blade that UH-60M uses ... but I'd need to check on that. They may have.
As with the original Seahawk, the "parts commonality" wasn't quite as high as originally advertised ... but it is substantial.