We have recently implemented a new version of the ESRI ArcGIS platform and are running the old geodatabase with the new one as well. Is there any functionality in FME to sync the old geodatabase with the new one. As of right now the two are out sync.

Hi @kiptas​ for a workflow where you want to sync data from an old database to a new one, I would recommend checking out our Change Detection article. For specific instructions, take a look at the Updating Databases: Using Change Detection to Set Operation Type article.

Using the ChangeDetector, you will be able to identify the differences between your old & new geodatabase and sync up and of those changes to the new geodatabase.