Could the US Navy preserve real parent-design commonality?

Could the US Navy have selected a parent design for Constellation and honestly retained something close to 85 percent commonality with FREMM?

The closing assessment doubts that 85 percent was realistic. About 60 percent is suggested tentatively, with a clean-sheet Perry-style frigate proposed as another possible approach.

FREMM itself is judged a sound design in the closing comparison. Roughly 60 percent commonality is suggested as a plausible alternative if American systems were introduced selectively and standards were adapted to the frigate. Even that outcome remains doubtful in an institution accustomed to designing its own ships around its own needs, often successfully. A clean-sheet American frigate governed by the Oliver Hazard Perry concept is proposed as another possible route. The closing argument favors making the choice between restrained adaptation and a new design explicit, while acknowledging uncertainty about whether either approach would have been followed.