Are you going to be installing DS4A using a different account on the computer? If so, you can just share the existing folder with the other user (before installing DS4A) and point the content installation to that folder (there's no difference in the content between DS4 and DS4A, though if the version numbers a re different that may cause issues). If you don't do that the only problem (aside from not being able to access the content) will be that all the SmartContent in the new install will show up as a bad reference.