Honda Accord EX 1992 Brake Calipers US vs. Japan version interchangable?

I have a 1992 Honda Accord EX made in USA with a VIN code starting with

1HG. I need to replace the front brake calipers. The PEP boys store lists two types, one for use with VIN code 1HG USA (like mine) and the other for VIN code JHM made in Japan. So obviously I asked for the USA version. Problem is these calipers are not the same as the ones on my car. The new USA version calipers have pins that are long bolts that thread directly into the caliper ears. The calipers on my car have pins that have a slot and a small bolt threads into the the pin. I assume somehow my car has the Japan version calipers even though it was made in the US.

Is this correct? Is that (the caliper pin construction) what is the difference between the two versions? Is that the only difference?

And the new calipers do not come with caliper brackets, so I need to use the existing caliper brackets that are already on the car.

So which version caliper should I get USA or Japan?

Are the two versions of calipers interchangable with the caliper brackets on my car?

Also are the brake pads the same for the two versions of calipers?

And a final question, the new calipers come with two copper washers for each side for the hydrolic banjo fitting but I'm pretty sure there is only one copper washer on my existing fittings. What is the proper usage of the copper washers on the banjo fittings? Two one each or only one?

thanks Mark