swapping b18a1 for b18b1

I have a 93 integra Ls 5 speed which is the b18a1 and I want to swap a b18b1 out of a 96 teg, now i have read alot of forums and nobody has quite addressed what I need to know. they say the 90 91 teg has the obd0 & the 92 93 has obd1 so what would the 96 teg have? ive herd that it went to obd2 in 96, is that true and if so what would i have to do to swap? would I just need the ecu or do i need the harness as well and what about the the intake mani or injectors or anything else?