ive heard of h22a2 from france. some dude on HP.com a long time ago before it went boom. he provided pics at the time, unfortunately i dont think i have them anymore.
i know the:

h22a = 92+ jdm closed deck block OBD 1 (i think they went open deck/OBD2 with the JDM type-s motor starting in 98-99??)

h22a1 = 92-96 USDM closed deck block OBD 1 (like it was stated above, honda went OBD2 in 96 and also had a huge recall because of it)

h22a2 = apparently france or europe

h22a4 = USDM 97-01 5th gen prelude OBD2

h22a7 = accord euro-r (basically OBD2 type-s motor)

i have a whole list from a webpage a long time ago.
i may have it saved somewhere but no promises.

~boom