Difference between PG and VG based aromas

Hello, there are aromas that are 100% VG based and 100% PG based, how do they differ? If i were to add these aromas to a 70/30 base, would that increase VG content of the entire e-liquid?

Original source: https://www.e-cigarette-forum.com/threads/difference-between-pg-and-vg-based-aromas.967801/