B18C3GSR

I did some research on the C3 thats in the 96 GSR that I just bought and am looking for info from you guys to help give me a good background on it. from what Im told the C1 is american spec and C3 and C5 is Jap right? Others say the C1 is also Jap spec. What are the differences between a C1 and the 3 and 5? Well this is what I found on JDMUniverse.com about the engines:

B18C3
..
Displacement (cc): 1797
Power (bhp@rpm): 200 ps@8000 rpm
Torque (ft/lbs@rpm): 15.5 kg-m@7500 rpm
Compression Ratio: 10.8:1
Bore (mm): 81
Stroke (mm): 87.2
Cam Design: dohc
VTEC?: yes
OBD: 1 or 2
Year(s) Produced: 1996
In the following car(s): Honda Integra Type R (JDM)

B18C1
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Displacement (cc): 1797
Power (bhp@rpm): 170@7600
Torque (ft/lbs@rpm): 128@6200
Compression Ratio: 10.0:1
Bore (mm): 81
Stroke (mm): 87.2
Cam Design: dohc
VTEC?: yes
OBD: 1 or 2
Year(s) Produced: 1994-2001
In the following car(s): Acura Integra GSR

B18C5
..
Displacement (cc): 1797
Power (bhp@rpm): 195@8000
Torque (ft/lbs@rpm): 130@7500
Compression Ratio: 10.2:1
Bore (mm): 81
Stroke (mm): 87.2
Cam Design: dohc
VTEC?: yes
OBD: 2
Year(s) Produced: 1998-2001
In the following car(s): Acura Integra Type R