ISAF international small catamaran handicap rating system has me confused.

Under Hobie it lists;

Hobie 20 Formula 1.02
and the Hobie FOX F20 0.95

and then totally separate from Hobie "choices"

Miracle 20 0.99

We recently purchased a Hobie Miracle 20, which rating applies? Is there an Euro or Asian version of the Miracle (Hobie 20 formula)? or is this a rating for the optional spi (or Miracle fitted for F20)? Which makes no sense that a "stock" Miracle would have a lower rating than a spi boat.

puzzled in prairieland