Hi Barry
Thank you for the correction that the 2227 cone lacks the ribs of the 2226.
But the 2226 cone is not curved, it's a simple cone, my pair was new from factory in 1994, definitely not recone parts.
The mass of the two cones is very similar, Mms is a little more for the 2227 but explained by the voice coil a little heaver.
So, mostly minutiae I suspect.
Best wishes
David