Easterns have darker colors in general then the western heavies. Their guard hairs also are not as straight there is more curl or twist in them
There is a progression from eastern, north central to western heavies and then there are others that are centrals, semi heavies, then coat coon. There are all sorts of sub grades in each of those very general groupings I have listed.
Where I live in WI I average percentage of north centrals are usually higher then westerns. I also have more C and D colors then even 30-40 miles west of me. I would think it is similar throughout the coon range but my females are usually better color with thinner hides and if they are big enough are my more valuable coons. Canadian is also another grade and they are just a thicker, generally darker colored as well.
In todays market I would even think the regions have shrunk even more and color along with fur quality is really critical.
Back in the days when coons were marketable many WI trappers would start day one catch a 100 or 200 in say 2-3 weeks and get $7-$8 averages in the grease. Those who waited a month generally would catch less then half that number, (fewer coon and harder conditions) and many times could not get $2 more then the earlier ones. Putting up and shipping helped but still there really was not much sense in waiting from a return point of view. Now we live in a totally different market, where the bulk of wild fur has value below the cost of processing.
Bryce