EAK filters are made by Champion Labs. (15,000 mile filter)
EAO filters are made by Donaldson. (25,000 mile filter)
This is what an EAO filter looks like inside. Notice the difference from the EAK above.
I noticed that as well. Was Camry engines of that era known for creating sludge? Although the 4th pic down looks great and very clean, assuming it wasn't cleaned.