Just my $0.02 - the epcdata.ru site may well be correct for your VIN - can YOU guarantee that your car has the original exhaust on it?
I moderate a number of vehicle forums and there's another forum on which I have been watching a member ask questions about his used JDM vehicle - what is unusual about this particular scenario is that the member is located within a mile of me and I know more about the vehicle he is working on than he does.
This is an individual that buys used vehicles, fixes them up and sells them - not unusual in the Caribbean - this particular vehicle he acquired from another guy who also does the same thing, but, in addition, the second guy imports used JDM vehicles parts which he resells, and the engine & transmission on the vehicle is not the original - something which I am aware of, and which the forum member is not - the original engine & transmission was pulled and sold to a customer and then another engine & transmission imported and fitted - the forum member is now chasing his tail trying to figure out why parts from the original engine are still fitted to the vehicle but not connected to the replacement engine, and how to connect them, when in reality, they don't belong because the replacement engine doesn't require them...
Back to your vehicle - can you be sure that what you are looking at is original or at least equivalent to the original? What I can tell you is that it would have been quite unusual for a JDM car of that vintage to have two O2 sensors.