Why not? I suspect that many people don't match nipples and spokes from the same manufacturer either out of ignorance or because it doesn't matter. I don't look at the box of nipples to see that they are from DT if I'm building with DT spokes nor if they are from Pillar if I'm build with Pillar spokes. In fact, most of my recent builds have been with Wheel Fanaytk splined nipples because they are easier to tighten and less prone to rounding.