Organic I at my school was four credits with no lab, followed by Organic II (three credits) and Organic II Lab (one credit). Altogether, I got my eight credits of organic. Between this year and last, I submitted almost 40 secondaries, and only one school insisted that I would need to take a second organic chemistry lab despite having eight credits of organic (it was EVMS). They also refused to accept my six credits of research in an organic lab as a substitute, so they were pretty strict about their policy. Every other school I communicated with either found the eight credits to be fine or allowed me to substitute my research credits for organic credits.
My advice would be to call admissions at the schools you're applying to and check their policy. Based on my experience, the eight credits should be fine, but YMMV.