As this excerpt from the 440 manual testifies, the 440 came with the short (USA)
mast option. Indeed, 12.5sqm less sail area.
See below:
Sail area close hauled (Standard
Europe mast) 113,30 m2
Sail area close hauled (Short mast) 100,70 m2
Battened
mainsail (Standard
Europe mast) 71,30 m2
Battened
mainsail (Short mast) 58,70 m2
The
mast will likely be a Sparcraft unit so I would contact them before you do anything.
www.sparcraft.com