It is closer than any other one. The standard "red" lense is really an orange-red when compared to the Audi dash. Darkstorm's "deep red" is almost perfect. But as you mentioned, it suffers in the daytime hardcore...
I changed my stock lights in my Eclipse to a deep red color, so i have the same issue as you. I've most recently gone to a smoke lense from Darkstorm. It's a greenish tint, but it's so far away from any other red bulbs, or from the red color, that it's been fine for me. And to boot, it looks great in the day (dark lens with dark dashboard), and it's legible in almost any lighting condition at all, even with the sun shining onto it through the back window. I do most of my driving during the day, so I took that over the color-matching.