There will not be any conversions to the Catalog of Lightroom 6 when opening in Lightroom CC 2015, as both are the same version.
Lightroom 6 ( Perpetual ) and Lightroom CC 2015 ( Creative Cloud ), so there should be no issues.
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LR 6 and LR CC 2015 use the exact same catalog format, you should be able to move your catalog file back and forth without problem.
Great news. Thank you.
You are Welcome, Glad we could help you.
Thank you for the quick response.