How to retarget rig "twice" in another rig?

Hi!
I have a rig for a single bed (for animating the duvet and pillow), and have also created another rig for a double bed which reuses the single bed rig, for the left and right side each. I want to reuse the animations that I make on the single bed onto each side of the double bed, so I don’t have to redo all animations.
Is it possible to do this? How would you go about it?
(I’m on UE4.27.2 btw)