Anon. Don’t know because I never use those mixes.
Make sure to use unsweetened applesauce. Perhaps you can also reduce the amount of sugar the recipe calls for to compensate for the oil/applesauce switch. (and you get a win-win situation. Less sugar and no oil).
That’s why it’s always good to try them first on the simple, cheap, and easy-to-make cakes, so you get the hang of it.