Hmm, maybe I was wrong, as I just noticed that the years listed for Arena Red Metalic are 1997-2000. Unless, your car was built in late 2000 and was listed as a 2001. Listed below, are color charts for 2000 and 2001, that I found elsewhere, which only list that color for 2000 and not for 2001. Regardless, you should be able to use the color code on the sticker to let you know which color it is for sure.
2000 Porsche All Models Touch Up Paint Colors
2001 Porsche All Models Touch Up Paint Colors