Not exactly an answer but some info that may help you determine the correct color. When I did the 95-up interior in my 3500HD project, I needed the lighter gray color that the new interior uses. I chose SEM "medium gray" pretty sure it was the # 15393 and it was a pretty good match, although still seemed somewhat lighter than the factory color. So with that, it would likely be way too light for the 1994 interior.
Dash, gauge bezel, knee bolster panel, kick panel are all SEM medium gray. The fuse panel and the air ducts are original (molded in color on those)
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Again everything is SEM medium gray other than the air ducts and the glovebox release button housing, which as you can see are slightly darker.
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FWIW the SEM holds up amazingly well, but I did follow the instructions to the letter. I cleaned all the pieces meticulously with TSP substitute and the two different grits of scotchbrite pads, then was super careful handling them so oils from my fingers didn't contaminate the cleaned surfaces. You may not be able to find "real" TSP (trisodium phosphate) but TSP sub worked great for me. Don't forget the SEM adhesion promoter.
Richard