Katie,
If you want a very close approximation of BM, and you have the CTX series, do either All-Step or Step&Intervals, followed immediately by PowerCircuit. Then do a half-hour upper body and abs premix of some sort (Muscle Endurance would work very well).
Body Max is one of those rare workouts that has a bit of everything thrown in: intense cardio, interval blasts, thorough weight work. SJP has all of those elements, but isn't *quite* as intense. You could certainly sub SJP for BM if you'd like, but I suggest that if you have the time, you tack on Push/Pull (as produced, not a premix) afterwards, to really give the muscles a thorough workout. I used to do SJP and PP together, in the era Before Baby, when I had more time to workout, and they complement each other very, very well.
HTH,
Sandra