There is no straight substitution I'm afraid because there will also be other ingredients in each recipe which will affect the liquid / dry ratio. (ditchthecarbs.com)
Please keep in mind that whenever you are using a substitute, you may need to adjust other ingredients in the recipe. (wholesomebabyfood.momtastic.com)
Since they add distinct flavor, make sure they're compatible with other ingredients in your recipe. (healthyflour.com)