Well, the Ohio is really old technology, by the standards of digitally aided design and production, but that doesn't mean that it is enherently louder than anything produced recently...
However, considering the massive size difference and the inherent quietness of fuel-cell electrical propulsion verses nuclear propulsion, I'd say that it is safe to assume the 212/4 is significantly quieter than the Ohio.
Note, that "significantly" is in physical terms... whether that has an impact during actual operational conditions, well it's a crapshoot.
I'm really out of my depth here... don't know what I'm talking about, so don't listen to me...
