Jack is from the old style working lines were conformation was thrown out the window in favor of working ability, Kechara is from a well meaning but no doubt money hungry BYB, and Hawkeye is from a high quality show breeder.
I guess the biggest differences between Jack and Hawk are the coloring but they are very similar structuraly, Kechara on the other hand is very bitchy and lean, but still has a beautiful correct aussie gait and the aussie temperment to the T.
and yes as Xeph mentioned I don't know what kind of ears Hawk would have ended up with and I wasn't going to take the chance so I taped them. BUt Hawk has a full sister from the same litter with extremely stiff errect ears.
You see in this picture From Left to right
Hawkeye's sister Shaine, Hawkeye's Mother Britta, Hawkeye's Grandmother Ling, and Hawkeye's Great grandfather Zephyr
Talk about different looks! lol