The drag coefficient of a 90-93 TT is 0.32 due to the IC holes in the fascia and the rear wing.
The drag coefficient of an NA is 0.31 so there isn't a huge difference.
But since you have a 1995 Z.I believe that because the wing was sitting higher you could have more down force that a 90-93 wing.
Also I noticed that the 90-93 rear wing didn't deflect the airflow that much is the wind tunnel test.
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