The 20th Anniversary guitar and bass have unique shapes. They are smaller than the Standard Point/Omega style, but they are not the 3/4 shape.
The woods on the 20th Anniversary were Walnut top and back with a Walnut core and Vermilion accent laminates or Quilted Maple top and back with a Maple core and Purpleheart accent laminates.
Anniversary basses were in 32 and 34 scale.
They also have the 20th Anniversary jewelry on the peghead.