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