ok, I just walked in from the barn to measure for you.
Here are the panel lengths for our saddles:
Wintec Pro Endurance: 22". However, the measurement of sweat marks = 20 1/2". The configuration of the cantle end of the panel tips up a tiny bit so the entire length does not contact the horse.
Wintec Pro Dressage: 20". However, 19 1/2" is the measurement of the sweat marks.
Durn, I didn't measure the width of the sweat marks....if you want them, I can get them. It would probably be different than your horse however, since the shape of the barrel would be a bit different. The endurance model has wider panels than the dressage, but only by about an inch. Also, the endurance panels are fabric instead of the equithane stuff that the dressage panels are made of.
Oh, my endurance pro has adjustable knee blocks (someone commented about no knee blocks on their endurance pro saddle) just like the dressage model has. I thought I remembered that it did (my daughter rides in the endurance pro saddle...I ride in the dressage pro). Personally, I like the dressage pro's seat position better than the more western seat of the endurance pro. Must be my hunter pleasure show background ;-).