American and Japanese Accords that were built in Japan or US for the United States are no different from each other in any shape or form. Everything is the same.

But now the JDM models made in Japan for Japan are different from ours

The ways you can tell if your car was made in Japan is if it has

a. "J" as the first letter of your VIN number. US made cars usually have a "1", Canada is "2", and Mexico is "4" i think.
b. "Made In Japan" sticker under the hood.

Also parts would not be hard to find at all since they are interchangeable from US-Spec to JDM-Spec anyways.