spacewalk add v's sync

Does anybody know what the difference is between
softwarechannel_adderrata and softwarechannel_errata_sync
Based on the output I would expect it to be that the sync will remove errata from the destination that are not present in the source and add errata to the destination to make them match the source whereas adderrata will just do the latter. .
However performing adderrata adds more patches and packages to the destination channel than errata_sync does


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