If both your plants are doing well and are healthy, then I would not recommend re-potting your two plants into one pot. Early Spring, March and April, is the best time to re-pot.
If you decide that you must do it then I would recommend re-potting your plants using a standard carnivorous plant soil mix of 1 part peat moss and 1 part perlite. Peat moss adds acidity and retains moisture, while perlite provides drainage. Some growers like to mix in silica sand for drainage which is fine also. I would highly recommend trying different soil mixes to see what works best in your growing area. Just make sure that peat moss is at least 50% of the growing medium.
I hope this helps and please ask, should you have any more questions.