Possibly, but not sure. They stated that you could use a real CD Key to upgrade your 10-Day Pass to a full account. Though they didn't specify wether you would get the Month free on top of that.
Though they did say that if you upgrade your 10-Day pass with a Collecter's Edition CD Key that any characters created "before" the real CD Key WILL NOT be able to get the special pet pass.
Only characters created AFTER you enter the CE CDKey will be able to get the special pet pass.