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The original color will no longer be a match 'cuz the gelcoat on a boat that old--any boat more than just a year or two old--will have oxydized quite a bit. So what you really need is advice on how to create a matching color.
(A bit out of my sanitation systems "wheelhouse," but I had to deal with the same problem when I restored a 20 yr old boat...have a little time on my hands, so decided to chime in.)
Like Peggie said, the original color probably won't be a very good match anymore, unless you're just looking to patch some really out of the way place. BoatworksToday does have some instruction on how to achieve the right color though -