René Decarte and Mind/Matter Duality

Which is the real René Decarte? Where is the unchanging Decarte?

First, a short description of the work of Decarte...
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By calling everything into doubt, Descartes laid the foundations of modern philosophy. In Discourse on Method he explains that human beings consist of minds and bodies; that these are totally distinct "substances"; that God exists and that He ensures we can trust the evidence of our senses. Ushering in the "scientific revolution" of Galileo and Newton, Descartes' ideas swept aside ancient and medieval traditions of philosophical methods and investigation.
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A central issue in process philosophy is around the unity of the stuff of reality. Decarte divided reality into the material and the mental or spiritual. One does not affect the other. We can use matter as so many dead objects, or as John B. Cobb, a process thinker, describes it that all we know in the world as just "matter in motion" and that all relationships are basically physical.  Thinking of the world in a Cartesian way allows us to us the material world in a disinterested way.

In Process Philosophy there is a physical and mental reality but they are not divided. Process philosophy does not unite the material and mental (because this is a model that uses objects) but focuses on process/evolution/change. All change so all are "in" process. Actualities (what is real in the world) are in process between the reality they have been to the reality they are drawn to be, between the physical and the mental poles.