I would take a few exception with goldenspike.
I'm not sure if CHSR will be totally segregated from Caltrain, Metrolink, and Amtrak and qualify for an exemption from FRA strength and collision requirements. Similarly, would PTC allow a waiver on both the NEC and CHSR? Why is a distinction necessary between Acela and Regional equipment? Furthermore, I don't think ethnic differences are so great between the Northeast and California to accommodate the differences. Perhaps a single design would suffice?
Other than wheel profiles and spring rates, how dissimilar would the trucks be?
The sharper NEC curves at 125 mph, compound or otherwise, are similar in angular velocity to the broader CHSR curves at 220 mph.
The miles of straightaway would not seem to be relevant since trains must track well on tangents on both lines.
Unless a sufficient market can be created with a commitment for additional or extended hsr corridors, it makes little sense to me to insist on American manufacture unless the extra cost is accepted by the government and mitigated by the domestic economic impact.