Creating New Prefab Entities Based On Original Prefab Entities In Code

I have 4 prefab entities that I have converted to game objects.

I want to now create 4 new entities that are those 4 prefabs rotated 90 degrees.

So in total I would have 8 prefabs, 4 original and 4 rotated.

How do I create 4 new entities that are based off the original and rotated so that I can Instantiate them in my system as normal prefabs?

EntityManager.Instantiate, then add back the Prefab component

Thanks, that did the trick.