Except the two parks are very different and really can't be compared. I think you need to stay in the same class.
Comparing IOA to Disney Sea would be a lot more interesting as would comparing Knotts to Dollywood or Lagoon. They are in the same class of park. DCA would be compared to DHS or WDS or maybe Epcot on a bad day. Animal Kingdom really should be compared to Bush Gardens or Sea World.
1. That's not how the OP sees things. He compares whatever he likes, and more power to him for that. It's his primary interest on these forums.
2. I think there's actually a decent amount of parallels between DCA and IOA:
-Both the second gate of a prominent theme park resort
-Both located very conveniently in proximity to their predecessor's gates
-Both parks were built in what had been the OG park's original parking lot
-Both had a new shopping & dining district open with them, as well as new hotels.
-Both marked a turning point in how their companies were perceived by the industry and fans
-Both struggled to get a true following outside of particular demographics until the opening of a major IP-based expansion ~11 years after opening
-Both feature launched roller coasters as headlining attractions
-Both feature significant river rapids attractions
-Both feature drop towers that were/are frequently contrasted unfavorably to Florida's TOT
-Both have come to be defined by the IP within their gates, for better or worse
They're not the most obvious comparison in the world, but there ARE similarities and comparable attributes between them. It's not like Yellowstone and Blizzard Beach are being compared here.