Accords in the US are generally US made, so it makes sense you'd get the same battery as a replacement in the US.
All WRX's are still made in Japan, so when the battery is warrantied, it's warrantied with what's available in the local market. It had a weird Panasonic battery which was replaced with a high end "official Subaru" battery". Out of curiosity, I peeled off the label and saw it was made by East Penn - a company that few people know of, but that makes some of the best batteries on the market.