I am sure, after all we had this helpful thread.
I focused on the edges of the sphere, it’s not a perfect match but look : in an ideal situation with displacement, since the top of the tile is raised, it should appear offset to the right as we approach the sphere’s edge. That’s exactly what I see in the Octane render. The Cycles render behaves “predictably”, ie as I would expect a simple bump to behave, that is losing the effect towards grazing surface.
Now there’s a chance all this is caused by the difference in lens. I would try to focus on grazing surfaces like these, zoom in, remove depth of field, etc. Cheers,