I have not CPOPed multiple scents together but, I can tell you that it wont cause any problems to do so. I CPOP almost all of my soaps. I have a lot of problems with partial gel otherwise.
When you CPOP, the scents only barely waft off the soap. You are only placing the soap in the oven (usually with it warmed up to 170 F then turned off) to ensure gel. That's it. You aren't cooking the soap like in HP. You have already added in your scents to your batter when doing CPOP. If the scents did intermingle on the finished bars themselves it would mean that you would have a significant scent loss which is NOT the case with CPOP.
You may get a mix of scents when you personally open up the oven to remove the soaps after CPOPing them in the oven. But, after 4-6 weeks of curing, no residual scents will be left on the bars. I've soaped tiny cups of batter as testers right next to each other and never have an issue with scent transfer.
Lion is right in the explanation.