That CC-350 model looks 8+ years old from what I'm seeing in a Google search, and it looks to be just a MTM design. So, unless you find one on eBay or Craigslist, it'll probably be difficult to purchase one.
I wouldn't be too concerned about the model number thing. If I had to choose, I'd look for that newer CC-190 you have listed. You might see if any of your local Paradigm dealers have a decent return policy for you to pick one up and try it out to see how well it will go with your mains.