I'm assuming you mean the contents, and not the dll files.
It depends on your spitfire settings... Globally you should check the spitfire audio app and check settings->default content path
But the contents can be installed on a different folder, so in the end it's case by case basis, you can check where each instrument is installed by going to the product, and then click on the cog next to "repair", and then locate.
But to answer your question, No, it's not necessary for the content to be duplicated (in fact it pretty much is useless...) But just be careful so you don't delete the ones that's currently being used.
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