In general these terms are defined in the following way. Keep in mind that publisher's may define these terms differently so if you're uploading previously published work to InSPIRe, you can check your publisher's agreement and/or SHERPA/RoMEO.
Preprints: Works before they've undergone peer review
Postprints: Sometimes called the Author's Accepted Manuscript (AAM), these are works that have undergone peer review but haven't yet been formally formatted
Publisher's version: Official versions of works that have been formatted and posted on publisher websites
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