I am surprised that no one is referring to the CRITICAL difference in the construction process: All AMEL, prior to the 55, have their bulkheads positioned and (more importantly) laminated/epoxied  to the hull while the hull is still in the mold. Amel originally wanted to do the same for the 55 but could not proceed with it as it resulted in a total boat weight exceedingly high.
So the 55 is indeed built like a Beneteau/Jeanneau.