Not exactly, no. The goal of variable rate is simply to improve the ROI of applied inputs. With certain properties like pH or phosphorus, for example, we may strive to 'even out' the soil test values and it is achievable. But the goal isn't to even out the values, it is to eliminate levels that limit yield potential such as low pH or low soil P.
Other properties like potassium and some micronutrients are inherently linked to stable SWAT soil properties like texture and soil test values may always vary. What's important is we are identifying levels that are limiting, and address them as needed.