It's hard to say how hard these pre-bootcamp workouts would be, even harder to compare to Plebe Summer.
Keep in mind one really important difference, though. These recruit workouts will only last and hour or two at a time. After that, you can go hang out with buddies, have a snack, take a shower, whatever. From what I have learned second hand, the difficulty of Plebe Summer & overall Plebe year isn't that any one workout is too hard. It's the totality of the experience. It's the stress of having too much to do in too little time for weeks and months on end, where morning "PEP" workouts are only ~1 hour of a 16 hour day.