How to set animation sequence on a group of actors at the same time?

Hey all! It’s my first time learning about animation sequences - as a start, I’m trying to get the islands in the attached picture to move back and forth. It’s easy enough to add keyframes to the entire group at once (just shift click and hit enter), but when I want to tell it where to move back to (the grey dot), I need to right click on each one individually, and then paste “transform.Location”. I can see this being really tedious - is there a way to copy / paste multiple to all go back to their original location?