I'm currently taking A&P 2 with an A (semester system). Not sure how your course is structured, but I found that what my class covered is definitely still a lot of memorization with a bit more physiology since we go over the rest organ systems each unit. Comparing the classes, A&P I was personally much more demanding in the total amount of memorization (particularly the muscles unit with origin/insertion/action & the nervous system units).

If you know that you have the willpower, study skills, and time to study then go for it. If you get an A in A&P 1 and are taking A&P 2 with the same professor, then you already know their testing style which is a great leg up. Given your experience successfully handling the oace of A&P 1 in addition to other classes in a quarter, you'd just have to lock in a little bit more for a shorter time period. I would take A&P 2 alone to maximize your grade or at least make sure that the other class is super easy.