Though this might help a bit (even if they are unflattering photos of Izzy and Frodo):
Here is Izzy, her coat is longer than Frodo's, and is much, much softer if you touch it (she has a bunch of butt fluff, but it doesn't show well in this pic):
Here is Frodo, his hair is much shorter than Izzy's, and is coarse to touch and also seems to be a bit more oily (It's probably easiest to see the length difference by looking at the shoulder region):
There was a big conversation on another corgi list that I am on, and it seemed to me that there were 3 diffferent types of common coats.
Working Coat (Frodo)
Show Coat (they used another word also but I forget what it was)
Fluffy Coat
Hope this helps
