Any HAH sold outside the clean states is bin5, which is LEV II for the clean states. They are equivalent air pollution ratings (6). The sticker on mine just says "ULEV/bin5" as does the fine print under the hood. The hood also mentions "LEV II in CA"The ULEV on the sticker with no I or II is a throwback to the older system in CA, I think?
ULEV II (bin4 for the rest of us) carries a higher rating of 7. I don't think the HAH got upgraded in the clean states, but it might have if it was tested on their low-sulphur boutique fuel? In any case, there is no difference in the vehicle- it simply tests cleaner when cleaner fuel is used for the test.
edit:
The HAH sold in CA, etc DOES carry a ULEVII rating- it scored a 7. 6 for the rest of the nation.
http://www.epa.gov/emissweb/E-HONDA-AccordHybrid-05.htm
Still, its the fuel not the car. Only the PZEV rating carries specific hardware changes (and better warrantee) with it.
This is only for the 05. I believe all 06s are PZEV nationwide (but only carry the warrantee in the clean states where it is required, I think)