I agree with @Claude31. You should put all the functionality in one app that can be used on an iPhone or iPad, then - with your two devices - allow the user to designate one of them as the Camera and the other as the Controller.
Note that the app should work on both iPad and iPhone, so you may have to change the layout of the iPad app you've already created.
Topic:
App Store Distribution & Marketing
SubTopic:
App Review