Not only do they have the "city" supplemental (194 type) light bulb, they also do not have the glare shields like the USDM ones. The "city" light comes on with the first click of your park lights and IIRC, the JDM Z's don't have a park light in the second section of the turn signal housings like the USDM ones have. Are your JDM ones damaged? Are you looking to do an HID upgrade to them?
:The ones I have right now turn on to a lower intensity when I turn on my headlights. I guess this is the same this as a daytime running lamp. Do the USDM fog lights have two lights in them? just like the JDM ones.