Watch the Perfect Fifth online guitar lesson by Kai Eckhardt from Atomic Bass: Reactive Intervals
This variation covers the same range of notes but shifts to the inversion of a fourth in different places. All interval drills presented here that use inversions can be played in different ways. Once you understand the underlying concept, you can make up your own variation. But for now you have plenty of work on your hands and I recommend you limit the amount of new stuff to a minimum. In general, when you want good results from your practice you should always simplify your approach as much as possible. Getting confused with too many variables is a well known danger that is often underestimated. So keep it simple and don't change things around until the new information is in your long term memory. Tonal centers are G, B and Eb (moving in major thirds horizontally).