These plates shift over hundreds of millions of years, striking different continental configurations along the way. (eos.org)
The periods considered were mainly the Pleistocene ice age cycles, the LGM and the Pliocene, but Paul Valdes provided some interesting modeling that also included the Oligocene, the Turonian, the Maastrichtian and Eocene, indicating the importance of the base continental configuration, ice sheet position, and ocean circulation for sensitivity. (realclimate.org)
Given the enormous uncertainties (for continental configurations, ocean currents, amount of volcanism, etc) in reconstructing these records, it would be suspicious and surprising if there were not such mismatches. (realclimate.org)