Yes, the PPG charts lists the light spatter codes for 69, 70, and 71 Fords. The PPG Ford charts for 72 and 73 Fords list the darker spatter. I've spent many hours looking at 71-73 Mustangs in junk yards in the 70s, and many hours at a Mustang only yard in the 80s. I have never seen a 71 Mustang with a light colored trunk. At the 429CJ Mustang Megasite we even have pics of 71showing a low mile unrestored trunk, and its showing the dark color??? I
wouldn't go by what you might JUST see on an aftermaket chart, especally if it wasn't updated correctly, or on time? There are plenty of unrestored 71 stangs on ebay showing the dark trunks, and there are also 69-70 big Fords there, showing the lighter gray, as those should. Here is an picture of the light gray from this 69 LTD.