do you know if the floor mats are the same size in all 2013 Chrysler 300 models

Check with the parts department of your local Chrysler dealership. They can check the part number of both models and see if they match. If they match, then they are the same. If they don't match, there must be a difference. Consulting those at the dealership may be the best resource because they know both cars and see them all the time.