That is a concern. I knew the one handed pop-over, then learned the clipshift, then I often had trouble going back to the pop-over. The moves are so similar, yet different enough that they can mess with your head if you are learning them at the same time. Not to fear. Like any difficult skill eventually you will work through it if you practice enough. If you truely have "mastered" the clip shift then you should have no problems in the long run but I wouldn't recommed learning both moves at the same time.