Hi K.G.
With 'site' I mean EV-site. This means also a different directory db.
In very short:
You have EVSiteOLD, having databases on SQLOLD. You create EVSiteNEW, with databases on SQLNEW. (seperate SQL (or new instance) meaning you will have 2 directory db's etc.). Both in same AD domain.
Move Archive between EVSiteOLD and EVSiteNEW.
When you use same Vault Service Account on OLD and NEW, you will not need to configure something in EV. Perform the Move from OLD to NEW ofcourse. there is one setting that might be usefull.
In EV program files folder on OLD, edit the EVMoveArchiveTask.exe.config file.
Look for header <MoveArchive>
<Common>
part <add key="WaitForBackupMode" value="2" />
When set to 2, Move Archive will not wait for a backup of archived items to happen on the NEW site. This speeds up transfer. YOu should really only do this when you are confident the data on NEW is being backed up properly! Otherwise leave as is, so shortcutprocessing only starts when data on NEW is backed up succesfully.
And, Ed's suggestion might be valid too.