The CA-14's have a non-removable foam windscreen, so they are larger than the CA-11's. The other difference is that the CA11 have interchangeable capsules - with the CA14's you have to buy a separate set of mics if you want cardioid and omni
Sonically, I'm not sure how much they differ. I have both, and I just use the CA14's more often, but not necessarily because they sound any better. My 14's have the alligator clips and my 11's do not. So that's probably why the 14's see more use - easier to mount. I'm sure you can order either set with or without the alligator clips.
I will have to do a shoot-out comp between the two at an upcoming show...