Seeding a Target Array - Then setup SyncIQ policy?

Here is scenario

• Data is on another appliance and is to be migrated to Isilon
• Data is already at source and target locations
• Data can be copied/migrated to each Isilon array, meaning we can copy the target data to the target Isilon

Can a Isilon SyncIQ policy be created without copying all the data from the source to the target over a slow WAN link?  Only pick up the differences after the migration to the Isilon.

Lemme know.

Thanks,

Dave