The CN212 is MUCH closer to the DB voicing than the very wide, relaxed, modern sounding AE212 to my ear.
The AE212 extends lower, doesn't have much of a low mid bump, and has a very even, relaxed upper mid response, with just a touch of a dip to my ear that lets the upper treble of the tweeter really shine (i.e., to not be masked).
The CN212 (to my ear) has a low end that does not extend quite as deep, has a bit more 'meat' to the low end (meaning a bit of upper bass/lower mid bump), and a VERY even mid mid and upper midrange response that makes the tweeter sound more integrated and 'organic'.
The DB, as posted above, is more about the mid mids, and does not quite have the range of the CN212 to my ear. However, definitely in the same tone universe (at least the 2 x DB112, which is what I owned a while back).
As a data point, here again is my short comparison clip of the AE212, the CN212, and the Thunderchild TC115.
http://www.youtube.com/watch?v=b3Md1FV4fUI&feature=player_detailpage
As an oversimplification, the CN212 is a more powerful, more even DB212, and the AE212 is more powerful, more even GS212 (putting this in Aguilar terms).
Just like the DB112's, the CN212 is magic with the TH500!

IMO!