73111-S03-Z00 is the part number for the 1998, 1999 and 2000 EK9 and 1998, 1999 and 2000 EK4 SiR windscreen. The manufacturer is AP-Tech. The windscreen is green
73111-S03-Z10 is the part number for the 1996 and 1997 EK4 SiR windscreen. The manufacturer was Asahi. The windscreen is green.
Honda only changed the manufacturer which produded the windscreens for them. Maybe AP-Tech offered Honda the windscreens cheaper. I dont know.
Please do not mix the JDM EK4 SiR with the EDM EK4 VTI! Thats why I wrote EK4 SiR! If you compare The EDM EK4 VTI with the EK9 you are right that the windscreens are different.
cheers guys