You can do the workouts on either day. The majority of your carbohydrates should be utilized during breakfast, pre-workout and post-workout. So even on low carb days you'll be having some carbs around the time of you workout. You can also use protein and/or BCAAs/EAAs to prevent catabolism.
Administrator, ABC Bodybuilding
Journal of HYPERplasia Research
"When your vision is powerful enough, everything else falls into place: how you live your life, your workouts, what friends you choose to hang out with, how you eat, what you do for fun. Vision is purpose, and when your purpose is clear so are your life choices. Vision creates faith and faith creates willpower. With faith there is no anxiety, no doubt - just absolute confidence." - Arnold Schwarzenegger