The relationship between Common sense blending and Baking of Fine Coffee beans

Is the relationship between matching and baking baking before blending, or is the relationship between matching and baking first? Which way is better? If you have a definite recipe, of course the easiest way is to put different coffee beans together and then bake them together. But if you are trying and comparing different ingredients and proportions, you certainly want to roast all kinds of coffee beans first.