Thanks so much for the info.
It definitely is all really confusing. The 5 way I was talking about includes these
Canine Distemper, Adenovirus Type 2 (CAV-2 cross protection CAV-1), Parainfluenza and Parvovirus Vaccine (MLV) and the 2 way only includes these two Parainfluenza and Parvovirus Vaccine.
http://www.jefferspet.com/images/265/7VCA.jpg