Yes, side A and B on those tapes are exactly the same. Each of the $14.95 Paraliminal tapes are the same on both sides. One session will help you attain your goal. Basically, you can listen to one side of the tape and when you are ready to use it again, you will not need to rewind the tape.
The $24.95 tapes include two sessions, each designed for a different purpose or to integrate a specific belief. There is a bit more pre-planning required in terms of thinking about your specific goal. Please give yourself at least 20 minutes until you listen to the session on the other side of the tape. This will give your mind time to integrate the goal or belief you have established. Think of it as incubation time.