a few years ago owned a 5.8m race sail that was a very full shape.
i replaced all 7 battens with battens from a larger sail.
i cut the larger battens to fit at more flex side[luff side]
the result my 5.8m was know went from the fullest sail on the water to by far the flattest.
keep your old sails and you can change big time the performance of a sail.
just remember cut the battens to fit at more flexible side, giving a stiffer batten.