Industrial capacity does not remove Japan's resource problem

What changes if interwar Japan has industrial capacity rivaling the United States and a fleet to match?

It can build a much larger fleet, but remains strategically vulnerable because its factories still depend on imported raw materials.

A Japan with American-scale factories could match the underfunded interwar US fleet and trigger a much larger naval construction race. Industrial capacity is not the same as economic self-sufficiency, however. Japan would still need imported fuel, ores, and other raw materials to keep those factories working. Submarines and blockade could therefore choke the enlarged industrial system unless the counterfactual also changed resource access and maritime logistics.