Yes thats correct, however if you set the "gui_mode" to "none" (so the original gui for the configuration isnt toggled) you cannt paste blueprints with the my chests. So if you paste a chest with id 15 over a chest with id 0 the id isnt changed.
Edit:
Just tested to confirm: If the "gui_mode" is set to "none" the "link_id" of the copied chest is not set on the pasted chest. This happens with copy paste (SHIFT + Right Click/ SHIFT + Left Click) and when pasting blueprints new or over existing chests.