the differences are:

30001 - B16A 88-91 (SiR I) Motor, Tranny, Computer
160Hp 111Trq 10.2 Compression (JDM)
$ 1250.00 Plus shipping and handling.


30002 - B16A 88-91 (SiR I) Complete Change Over
160Hp 111Trq 10.2 Compression (JDM)
$ 1499.00 Plus shipping and handling.


30003 - B16A 92-93 Integra (XSi) Complete Change Over
170Hp 113Trq 10.4 Compression (JDM OBD I)
$ 1699.00 Plus shipping and handling.


30004 - B16A 92-95 (SiR-II) Motor, Tranny, ECU
170Hp 113Trq 10.4 Compression (JDM)
$ 1750.00 Plus shipping and handling


30005 - B16A 92-95 (SiR-II) Complete Change Over
170Hp 113Trq 10.4 Compression (JDM)
160Hp 111Trq 10.2 Compression (USDM)
$ 2250.00 Plus shipping and handling

it lists the differences right there.. compression, hp, torque.

as far as ease of swap.. every B series engine is the same (minor differences with wiring on some)