We tried this years ago... you're going to need to customize your shrouds and forestay.... the 19 rigging will work, but you're going to need some fine tuning that will hit the limits of that rigging... Working from memory I believe there is a three inch difference in the two.. Also, get the bigger rudders. And, do not stand the stick straight up, have some rake in it...
Oh! Keep the original rig... you'll need it in heavy air