Steve,
some of the differences.
1.  Wheels are 5.00x5
2.  Trailing arm is a weldment instead of a casting
3.  Gear door is a two piece instead of three.
4.  Gear door is a separate molded part (no longer cut out the wing
skin) and has extra camber to get around the gear
5.  Flap actuation is via torque tube behind the rear spar and short
pushrod to the inboard flap rib to make room in the wheel well.
 
Chris Zavatson
N91CZ
360std
www.N91CZ.com