I recommend that you contact the company at this link:
https://www.seatdoctors.com/porsche-leather-dye
They offer dyes mixed to match Porsche interiors. It is more expensive than shoe polish. I think it would be a better match for the color of your seat and you won't need to be concerned that shoe polish may rub off on your clothes.
I used their dye to completely re-dye a pair of seats in another car I own, and I was pleased with the results. You can see my work here: https://mbworld.org/forums/c-class-w203/716541-seat-swap-2009-c63.html
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 12-way driver & 8-way passenger seats, Litronics, silver console
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