The debate between proponents and opponents of causal foundationalism has recently surfaced as a disparity between causal structuralism and causal anti-foundationalism in the structural realist camp. The paper outlines and dissolves the problem of disparity for (informational) structural realism. I follow John Collier (also Carl T. Bergstrom and Martin Rosvall) to specify causation in terms of the transmission of information. Unlike them, I built upon the reverse quantum data-processing inequality to show how this approach models causation as a symmetric process at the level of fundamental physics (but not special sciences). I show how this suggestion reduces the disparity about causation to a problem of application to diverse contexts.