I agree about not needing both, there is probably some overlapping (haven't looked at the ingredients list). The nutrobal was really popular here in Finland for tortoises a few years back.
We don't have those products over here, but what you need it a calcium supplement, and a vitamin supplement. Use a small amount of the calcium mixed in with the greens about twice a week. Use the vitamin powder once a week.
These are just general guidelines. A little more or a little less might be indicated due to your situation. For example, you can skip the supplements entirely for a full grown male that is eating a wide variety of weeds, leaves and flowers. Conversely, you might want to use calcium three times a week for a growing baby, or for an egg laying female that is eating mostly grocery store greens, which lack calcium.