The same things have to be done to chip the small-case JDM ECUs as the big-case USDM ECUs, but all of the parts (except the chip socket) are a smaller package for the JDM. It's like a Reeses mini cup or a snack size cup, they're the same thing but one's smaller than the other. Because of the difference in part size, they're a little more tricky to do for someone with average soldering skills. I'm a professional circuit board technician so it's cake for me (I've moved out of area though). Anyway, there should be some people in the area there (think shops) that can do that for you without a problem. If they can't, they need to get some skills.