Both are EKs............. BUT
OBD2 has 2 version OBD2A(<1999) and OBD2B(>1999).
So get the one(PCT) matching your socket.
Performances? Rev cut/speed cut will still be there .... unless you manage to get a PCT that
is already "chipped". Other fuel/timing map... a liitle diff.
Popular option... OBD2-->OBD1 convertion harness
Plug and play EG (p30/p08 chipped) ecu (many types of chip choice)
Fine tune with VAFC2 or e-manage.
Got extra money? Hondata/chrome..