In the first account go to Listing Activity - Ended Listings - Unsold. 

Select items you want to move. 

Select sell similar.  They will now appear in the "Waiting to upload Tab" 

Create a new folder in Inventory. 

Select all items in Waiting to Upload and drag and drop into the new folder in Inventory. 

Now export as Turbo Lister Format CSV file and reimport into your other account.

I would back up your TL files before doing this as TL is pretty flaky and can crash when doing drag and drop operations.