I know it sounds like they would be the same, but they're not. They are next to each other, but both are seperate resorts. The campground does have two pools, although they are pretty plain, but it also has a lot of neat stuff to do on its own.
So, sorry that you can't use the Wilderness Lodge amenities, but you should still look into the campground - it has a lot to offer, and my family enjoyed it when we stayed there. Just so you know, though, the campground is so big that from the cabins, you take an internal bus to everything else, including the other transportation, so it's not always the most convenient place to be.