In terms of bhp difference between the 1.6 and 1.8 this is what I have found during my research (hopefully correct)
UK Cars Only
Mk1 1.6 - 89 to 94 = 114bhp.
Mk1 1.6 - 95 to 98 = 88bhp.
Mk2 1.6 - 98 on = 108bhp.
Imports
Japan never used the 88bhp engine so all imported Mk1 1.6 are 114bhp.
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Year Model Chassis Engine code Transmission Power
1989–1993 1.6i NA B6ZE(RS) 5-speed MT 114 bhp
1995–1998 1.6i NA BP-4W 5-speed MT 88 bhp
1998–2001 1.6i NB BP-4W 5-speed MT 108 bhp
1993–1995 1.8i NA BP-4W 6-speed MT 128 bhp
1995–1998 1.8i NA BP-4W 6-speed MT 133 bhp
1998–2001 1.8i NB BP-4W 6-speed MT 140 bhp