Your downloaded Dreams are kept here C:\ProgramData\Stardock\DeskScapes\ExtractedData
With Deskscapes loaded on the second PC just copy to that folder.
Same goes for Pictures are kept here C:\Users\Public\Pictures\Stardock
copy to same folder on second PC.
Or if in Managed Folders duplicate that on the second computer
then copy all pics to that folder .
Stardock Community Assistant