I made a new prefab for a Landing Pad in the Sandbox Level and changed the tag and color, but I notice that the landing pads for Level 1 and Level 2 are still associated with Launch Pad.
How do I relink the other landing pads to the new Landing Pad prefab without recreating them?
Hi and welcome to the community 
If you select the landing pad GameObject in the Hierarchy, assuming it’s text is blue which indicates its a prefab instance, you can then click on the Revert button in the top of the Inspector. This will then revert that prefab instance in the Hierarchy to however the prefab under Assets is configured.
Hope this helps