The places to look for
DDO and
DDR on the centers of the devices:



The center where the cross lines are is where to look for the doubled dies.
The die clash looks like this:



So looking at the intersection areas, you might find the new
DDO or
DDR on these. Become familiar with what looks normal in these areas. You might even take a close up of that area, to compare with when you think you found something different. The doubling will be some part of the design, that rises up, where it normally doesn't on the other examples. Keep us posted as to what you find.