^ I'm afraid KI nor CP have 'speed' passes (except for the 'vip experience')
At CP you can get in 1 hour before opening if you're staying at one of the CP hotels or if you have a Platinum season pass.
If you want to ride different type of rollercoasters, visiting both KI and CP in 2 days is a good choice imo. Together that will be some 30 new coasters you'll be riding.