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I believe the standard seats are similar to the ZO6 seats as they have no halo at the headrest but they have a larger pleat that is not perforated. I've only seen them in some of the earlier C5s and the '99 & '00 FRCs.
The ZO6 seats have the tighter pattern perforated pleats, a little more bolster and no halo at the headrest. They also have the ZO6 logo embroidered in the headrest, except for the Z16 which had a C5 24 hour logo.
The sport seats have the same perforated tight pleats as the Z with the halo in the headrest. I would think that they have about the same amount of bolster as the Z as well.
My information is all on my assumption, so if anything needs corrected I'm sure someone will step up.