Foam can give more detail, but basically...
Creole is City Food. More refined with prime ingredients. Your not likely going to see a recipe for Creole Pigs Tails and Chitterlins. It makes a much bigger use of Tomatoes in sauces, and recipes, along with Celery, Pepper and Onions. Creole is not necessarily Spicy Hot. A much bigger variety of Herbs, Parsley, Rosemary, Basil, Bay Leaf, Thyme and Oregano are most common, so is the use of Paprika.
Cajun Food is Country Cookin'! Supper is just as likely to be what Poppa, Shot that morning as Store Bought Meat. That don't happen everywhere, but you get the picture.
While there are some use of Herbs, Bay Leaf, Parsley, Thyme and Oregano, SPICES are the mainstay. Black and White Pepper, Cayenne Pepper, Mustard, Dry Garlic, Dried Onion and Paprika. The Holy Trinity of Onion, Celery and Green Bell Pepper is usually there along with Fresh Garlic and Green Onions.
My Cajun Rib Tickler, is not exceptionally hot but likely more than your average Kid can handle. If you need more mild, skip the Cayenne... Need to go full on, add 2 teaspoons White Pepper and 2 tsp Cayenne...JJ