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I believe the diameter is the same for both wheels in the 992. However the GT Sport Steering Wheel is thicker. The trim surrounding the floating controls on the spokes is different. On the regular wheel, there is a silver outline, whereas the outline is dark gray on the GT Sport Steering Wheel, and there are decorative bolts at the corners giving a bit of an industrial look.
The steering wheel is a stand-alone option. The standard wheel feels quite thin to me compared to other “performance” cars, although some here who had a chance to sample both prefer it to the GT.