Currently, you can sync pieces already on Saatchi and Art Finder with your Vango portfolio to prevent duplication. We also can sync the existing data you have with Vango so its retroactive (not the trends but the absolute numbers like total views, Favorites, etc.).
To match artwork, first integrate your gallery (i.e. Saatchi), then go into the 'Distribute Artwork' page under Integrations on the side bar. You should see this following pop up. Go through each one to match.
Coming summer of 2017 you'll be able to import photos that are in other portfolios but not on Vango into your Vango Studio portfolio.