Hi Susan,
You can read a description of the
Coronado Springs junior suites on the Walt Disney World website. As you'll see, the junior suites have two bathrooms, two queen size beds, and a queen-size sleeper sofa. This means that the suites sleep up to six guests, four of which will be on real beds.
A standard Coronado room has one bathroom and two QS beds. Meaning that with two standard rooms, you'd also get two bathrooms, but you'd instead be able to sleep eight guests on four real beds.
Size-wise, you'll get approximately the same number of square feet with a junior suite or two standard bedrooms The real difference is the type of bedding and number of sleep surfaces.
Good luck with your planning. Please let us know if you have additional questions.