Having a big football watch party on Saturday so I needed a lot of pork. Largest butt I could get was 9lbs so I will be doing a 9lbs and a 4.5lbs butt. Is there anything I need to do differently with these since they'll be in the smoker together? Can I just start the 9lbs butt 18 hours before we're ready and then put the 4.5lbs butt in with 9 hours remaining? Thanks!