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May 9, 2015 9:36 PM in response to cube60by LarryHN,★HelpfulThat is correct - they share the same original photos so there is very little space used by the second one - see Photos saves disk space by sharing images with your iPhoto or Aperture libraries - Apple Support
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May 9, 2015 9:35 PM in response to cube60by R C-R,★HelpfulDon't delete anything unless & until you decide to quit using one or the other app. The file space used is not what it seems. See Photos saves disk space by sharing images with your iPhoto or Aperture libraries - Apple Support for more about that, or this article if you want the gory details about how it's done.