My understanding from talking to James Espey when I needed the correct early paint code is that the first page is a water based formula (i.e. EHP - Envirobase High Performance), and the second page is the oil based formula. You can see the difference in the "VOC less water" section. I used the MSDS # DBU1 (i.e. Deltron Basecoat) on the second page with a gloss finish when I re-painted my fascias in 2015, as the original method was oil based. It turned out well:
Apparently the Deltron DBU product has been discontinued from PPG in 2017 (announcement HERE ) so your paint supplier will have to match/ convert it to the paint system they use.