Replacing Japan's heavy cruisers with Omaha-class ships

What happens if Japan's heavy cruisers become Omaha-class ships while the US Navy's Omahas become Takao-class heavy cruisers on 8 December 1941?

Japan's cruiser arm is crippled and early battles such as Java Sea become much harder, while the United States gains 10 powerful Takao-class heavy cruisers.

The counterfactual replaces Japan's Furutaka, Aoba, Myoko, Mogami, Takao, and Tone groups with Omaha-class light cruisers while the US Navy receives Takao-class heavy cruisers in place of its Omahas. The resulting exchange removes much of the fighting capability of Japan's heavy-cruiser force. The Java Sea campaign is offered as an example of an engagement that would become much more difficult for Japan. The United States gains 10 heavily armed cruisers, each with 10 eight-inch guns, in place of its older Omahas. The benefit and loss arise from exchanging different kinds of combat capability, even though the number of replacement hulls is unchanged.