No, not quite.
A food court is a collection of small restaurants, which could be concession stands, or snackbars, or as I mentioned, a small restaurant.
Concession Stand and Snack Bar are often used interchangeably but generally a concession stand just sells candy, chips, popcorn, pop, beer, that sort of thing. You won't find much, if any, hot food at a concession stand. A snack bar will sell everything the concession stand sells, but also has a grill for burgers, hot sandwiches, fries, etc.