I bought the Cold weather CCV when I replaced mine a few years ago. The only difference I can see is that flimsy foam jacket that goes over the CCV and part of the hoses. I suppose it's better than nothing but I really can't see that foam making any difference at all in the extreme cold.
Imaging if you had to sit outside in -40C weather. I don't care if you are wearing the best thermal jacket that's made out there. If you don't start a fire for heat, you're gonna freeze.