I have the same ones. For 2012 the missions had the same highback as the 2010 cartel and also the same base.....but different straps I believe.
They've been changing highbacks a lot lately, but from what I've read the 2013 cartel is suppose to be softer than the 2012 cartels. The "stiffer" high back of the 2012 cartels is now on the 2013 missions while still sharing the same base. A little confusing, but in the end the missions might not be much if any softer than the cartels anymore.
rabbitsnowboards had some really good deals on burton before the season if you don't mind buying used or demo