No. There are different types of contextualism based on their specific goals. Many forms of contextualism (such as hermeneutics, dramaturgy, social constructionism and so on) are forms of descriptive contextualism which seek to appreciate the participants in the whole. Functional contextualism has as its goal the prediction and influence of behavioral interactions with precision, scope, and depth. The best way to understand the difference is to go to the publications pages and download articles on contextualism. You need to be an ACBS member to do that, but it is cheap so the best thing to do is just to click here to learn how to join.