Hi Picknmix,
I think you will love A'kin's rosehip and the cellular radiance serum. The only difference is that they smell 'earthy'(I don't find them unpleasant at all), but not quite the same as the aromatic AD oil you would be used to.
If that does not bother you, then the difference is that the rosehip oil is slightly heavier then the radiance serum. I prefer the texture of the radiance serum, because it's lighter of the two. For your combo skin I think you might prefer this,too. Also there are more ingredients in the serum, and only rosehip as the main ingredient in the oil. What most people do is use the rosehip at night for a boost in nourishment and the serum during the day as this also has very potent antioxidants which are very important during the day for sun protection. Hope this helps.