My instruction manual has specific installation instructions for IIci. Lowend Mac even has benchmarks of a IIci with a Presto upgrade. That's why I was asking. Perhaps they were just two completely different accelerator cards, one for the LC and one for the IIci?

Edit: Answered my own question. I even found the product. They made a separate Presto 040 for the IIci, IIcx, IIvi, IIvx series.