i thought that both JDM engines were stampped B20B, '95.5-00, and that the difference was in the later japanese model's PHK pistons (allthough some had the p3f pistons), the ones that are in the B20z and give it the higher compression ratio.
i could be incorrect, as i got this info from honda tech. I also recall reading something about the 97-98 spec engines that came with 5speed and 4wd having a 9.2 c/r
in short 99-00 JDM B20B = 99-00 USDM B20Z, but some JDM b20b's have the lower compression pistons, and some 97-98 have a third option.
after re-reading this i seem a little confused.
Honda-Tech.com: Tech/Misc: B20B VS B20Z... The truth told, lets end the rumors